Maybe not, in fact. Some tools works with files (or file formats) that are the same between the two versions, so it's highly doubtful those ones only work for the PC version.
Indeed, programs like
Jenova, the save editor won't work, since the save headers are different, nor will any program editing ff7.exe. On the other hand, tools like
FiceLZS (LZS archive extractor),
Scene Explorer/Scene Edit (for editing scene.bin) will work with the PSX version : I tested them with the US version, I had no problem.
The main concern here is to know what you want to modify and where it's stored. For instance, if this is located in ff7.exe (for the PC version), you're most likely screwed. If this is located in scene.bin, there won't be any problem.
(By the way, nice to see you here, BrutalAl
)