Quite a jump – the Culture are, basically, several hundred Omegas. Or MORE than Omegas. And they don’t rely on portals. And they probably control a LOT more space.
That said, their powers aren’t that similar to the MC of Demon Accords. So they may not have the ability to easily counter Chris up close. Or Declan.
On the other hand, the Culture are probably more open to dialogue than the Vorsook.