The only real change comes when you get something that gives a Skill Bonus that doesn't exist in pathfinder.
Ex: Chameleon: Instead of the Move Silently, Hide and Disguise, it would be Stealth and Disguise
or if a feat it gives doesn't exist, change it to a similar one or just call the mutation off.
Either way; if you run into any problems, there is always the Option of DM Fiat: Aka. That ain't working, have a free change.