variance in $x/$y PLO vs. $2.5x/$2.5y CAP PLO

[cmyr]

I hope the title is clear, although I concede it might not be.

so: I haven't played much CAP plo (the version on FTP where you can only commit 40bb to a pot at a time) and so I'm really not that sure how it plays, but seeing the 25/50 going regularly has got me thinking: How much would the 'variance' (pardon my impercise usage) in a game like this differ from a game of 10-20 PLO, given that the most you can 'buyin' for, on a given hand, is always going to be just $2000? What sort of impact would this have on the standard deviation, in $$s?