i did it!!
i just copied my zoo tycoon floder content to the other zoo tycoon endangered floder and it worked
Edit:
o yeah, i forgot i did something else too... i copied the file x100_001.z2f and made another file of it, but renamed it to entities.z2f ....
and it just worked somehow
but becarefull when you are copying the files (if someone ever will..) because there's a file that is called entities.z2f in the zoo tycoon folder, and you don't want it to replace the other one, so just copy all your content except that file and you'll be fine... i think
i'll say if there will be problems..