Converting Monsters Backwards

[Dragonwriter]

As the title says, how easy/difficult is it to convert monsters back to 3.5 rules? I've been looking at a variety of monster books (especially ones currently on sale) but don't want to add a lot more work to use a creature than I already have, as I still just run 3.5 and don't intend on converting my games to PF for a while yet, if ever.

Is it simple and quick? Or are there a lot of changes to what creature types and subtypes grant? Or would it be a bit of work but still probably worth my time and money?
I really haven't looked at a lot of the detail-work in what PF changed for monsters...

(In particular, I was looking at some of the stuff by Super Genius Games, since they're at a low price right now. If anyone has any recommendations or warnings, they'd be much appreciated.)

 

[Voadam]

Quick and dirty.

Change CMB to grapple modifier. If different than medium size add or subtract 3 as appropriate as PF uses a size modifier of +1 vs 3.5 using +4.

For spell-likes and class abilities or spells or items use your choice of PF or 3.5 versions where they are different.

 

[Voadam]

Is it simple and quick? Or are there a lot of changes to what creature types and subtypes grant? Or would it be a bit of work but still probably worth my time and money?
I really haven't looked at a lot of the detail-work in what PF changed for monsters...

Some types and subtypes changed a little. Sort of like 3.0 to 3.5 where constructs and oozes switched who got bonus hp for size and monstrous humanoids changed. Not a big deal for the most part.

In Pathfinder undead have 3/4 BAB instead of 1/2 and are not immune to crits/sneak attack. Constructs and plants are similarly not immune. Elementals are an outsider subtype, not a type, and are immune to crits and sneak attack. Oozes are immune as well.

Giants are a humanoid subtype, not a type.