Manchester City and Paris Saint-Germain both tend to get lumped together as a modern football phenomenon - and tomorrow night’s clash has been predictably dubbed the Oil Firm derby.
But, while the takeovers by rich Middle East men has undoubtedly transformed the fortunes of both, the direction they have taken on the pitch - other than spending big money to achieve success - could not be more different.
And so, we see a City team funded by huge investment but founded on socialist principles - everyone pulling together, no superstars, no egos. Team is everything to Pep Guardiola, and woe betide anyone who steps out of that line.
On the other hand, PSG are a team with a split down the middle - one that has City-style team ethic, until you get to the front players, who are three world-class individuals desperately trying to find a way to work together.
At the weekend we had Guardiola praising Bernardo Silva for the way he has swallowed his disappointment at not getting the transfer he wanted, and covered every blade of grass at Stamford Bridge as the Blues overcame the reigning European champions on their own turf with a show of collective might and a well-oiled, exquisitely-balanced machine where every player is only measured in terms of the working whole.
At the same time, Kylian Mbappe was spotted complaining that Neymar “never passes to me” - and there are even suggestions he called the Brazil ace “a tramp”.
That may not be a major issue - PSG have played it down, and Angel Herrera laughed it off by pointing out that if he and Leandro Paredes have a row on the pitch, no-one cares.
But manager Mauricio Pochettino, apart from dismissing the Neymar-Mbappe disagreement as a spat, and once he had sorted out by speaking to the two players, could not help but refer to the issues that having three such huge superstars gives him.
Asked about the harmony in the camp, he said: “The team is happy and calm. The players are training well. There is a good atmosphere.”
Oil being poured on troubled waters, maybe. But then he added, unprompted: “As I have said, this is a special club. Maybe we do things differently from other clubs.
“As part of this family we know there are special situations that might not arise at other clubs, so we have to find the right balance at the heart of the team.”
That issue was also flagged up by Angel Herrera, who drew his own line between the potentially fearsome MNM forward line and the rest of the squad.
“If you want to be successful you need everyone on the team - this is my work. I am a team player and try to be available if the coach needs me," said the former Manchester United midfielder.
“We have stars in this team, incredible players but we also need the players behind them that are strong and fight for the team."
In other words, the three men up front are not expected to do a stint for the team, in the way City’s attacking trio of Phil Foden, Gabriel Jesus and Jack Grealish worked tirelessly for each other at Chelsea.
Pochettino has a major problem, not just in managing such egos, and the way they relate to each other, but also in keeping cohesion and team spirit in a squad in which there is an aristocracy and a peasantry.
PSG have many fine players, and City will face a tough time, especially off the back of such a monumental effort in west London just three days ago.
But they have one big advantage - they are a team of 11 players, rather than one of three global superstars and eight others.
Paris is a city that knows only too well what happens when that particular divide gets too marked - the guillotine falls. And it is Pochettino’s head that will be first on the block.