I know this is a really stupid question and the answer is probably "no the templates are different" but I just read a hack that said it was for 3.5.0 and claimed to work with 3.0.7 so for that matter I'm asking do 3.5.0 mods work with 3.0.7 or not?
Depends on how it's implemented. If it uses the plugin/product system, no, it won't work. If it's a straight hack, then it may work. Depends on the mod and where the changes are made.