When two Swiss international strikers, both 23 years of age, pitch up in Glasgow at roughly the same time there are always going to be comparisons made.
Ajeti arrived having barely had a look in at West Ham last year and was expected to need time to warm up to life in Scotland.
But despite a slow introduction in terms of minutes, the former Basel striker has made a huge impact already.
In contrast Itten, who arrived fresh from scoring 10 goals in 12 games in the Swiss top flight, has barely made any impact at all.
You might think the Rangers striker hasn't had much of a chance but both have had roughly the same amount of game time with Ajeti on 229 minutes of action and Itten on 224.
With four goals in seven appearances the Hoops' new boy has been a difference maker and looked sharp in his first start against Livingston.
While it's early in their time in Glasgow and everyone adapts to a new club differently, the instant impact of Ajeti at Celtic is a major boon for their title aspirations and provides top-class support to Odsonne Edouard.
Both strikers arrived in Glasgow with impressive CVs.
While Ajeti failed to make any impact on the Premier League and failed to score in 12 appearances, West Ham can hardly say they gave him a major chance to succeed given he didn't make a league start.
His time at Basel is a better indicator of what he could do at Celtic Park given their domination of most games in a domestic setting.
He scored 43 in 93 games while he also showed he can be a useful creator with 21 assists.
That's a goal every 144 minutes, a record he is already ripping to shreds at the Hoops with a strike every 57 minutes.
Itten scored 19 league goals in 34 showings for St Gallen last season making him the second top scorer behind Young Boys live-wire Jean-Pierre Nsame.
His total means he hit the net once every 138 minutes so he's very much operating behind the scoring level you'd expect at Ibrox so far in his six goalless appearances.
Style of player
Statistics site InStat has a feature that compares players' numbers to obtain a snapshot of their footballing profile. Itten's data tells a story with compatible strikers listed as Moussa Dembele, Dominic Calvert-Lewin and one Alfredo Morelos.
Watching a compilation of all Itten's touches so far it's clear he's operates well with his back to goal and has the potential to be a top targetman.
He's strong, quick and his time at St Gallen shows he can finish as well so there's plenty there for Steven Gerrard and his management team to work with.
Ajeti is a bustling, all-action striker who reminds you of former star Scott McDonald.
The Aussie used his excellent movement to sniff out chances but he also uses his backside brilliantly to help shield the ball.
While he's 6ft tall, Ajeti is mobile and moves with a low centre of gravity for his size. He also presses with real intent and works extremely hard.
He's a pest to opposition strikers, harrying constantly and it's clear he offers something totally different to the more refined Odsonne Edouard.
Adapting to Scotland
Ajeti's four goals have showcased his coolness in front of goal and the finish against Livingston showed a man operating at maximum confidence.
Robbie McCrorie had rushed out to narrow the striker's angles but the Swiss striker was able to curl the ball past the on-loan Rangers man with a wonderfully precise sweeping shot.
And while some strikers can perform brilliantly in such situations on instinct but struggle when given more time, Ajeti showed against Motherwell he's just as deadly when he has the time to size a situation up.
Poor defending by the Steelmen meant he was able to collect the ball in the box and set himself to shoot without pressure but the emphatic way he thrashed the ball home was an impressive display of decisive finishing.
While both are clearly talented players, there can be no argument that Ajeti has settled quicker and imposed his style on the Celtic team more quickly than most would have expected.
For Itten, there's a big difference being a powerful striker in Scotland and in the Swiss league which is much less physical. The level of intensity such a striker is operating under is a real test of his technical prowess and it's clear he needs time to adjust to having much less time on the ball.
While he has decent control, there have been a few moments when the pressure from defenders has prompted a mistake and the ball isn't sticking enough yet for a Rangers central striker.
The example below shows Itten taking the ball in well but his lay-off to Tavernier is put straight out of play.
The crumb of comfort so far is that Itten's best performance came in the 45 minutes against Kilmarnock when he was played in his best position as a central striker.
Steven Gerrard has also used him on the right as a second striker but he looked largely out of place and blasted his one major chance wildly over the bar.
The second half saw him pushed up into his natural role and he looked much more comfortable and was seen getting in and around the box a lot more often.
With Alfredo Morelos sticking around for a lot longer than expected it has left the Swiss striker looking like something of a spare part given they both carry a similar threat.
And until the Colombian moves on it's easy to see a situation where their new boy will struggle to make the expected impact.
It's early days in the title race but as one side's new striker fires on all cylinders while the other adjusts slowly, their contrasting form could be an important staging post for the eventual destination of the championship.