Is it difficult to run a straight 3.5 party in a straight pathfinder adventure?

[killem2]

Titles explains it all. But I am considering buying the Way of the Wicked series.

But we have no pathfinder stuff. I know it's fairly compatible but what about the monsters is the XP given appropriately scaled for 3.5?

[Stoneback]

I've run my three-fivers through several PF modules without any translation troubles.