idle pulley interchangeability

[UCSLugRacerX]

Today was a day at the junk yard, and I found a 1G Laser RS, which was FWD 4G63 turbo with the pop-up headlights.
I needed the idle pulley from it, so I pulled off all the parts which were in the way, and unbolted the idle pulley.
Although, I noticed after I bought the idle pulley, that it seems like there is a little bit of play (but not too much) in the sealed cartridge bearing.
More importantly, the idle pulley is FLAT on where the bolt head meets the outside of the pulley, whereas on my 90 GSX, the pulley seems to dip downward which looks like a big crater around the bolt head.
My question is, OTHER THAN AESTHETICS (the way it looks), are all 1G 4G63t idle pulleys interchangeable?

Thanks!

 

[pianoman]

i have a 90 and when i did my timing belt my pulley wasn't in that great of shape, so i pulled one off my spare motor which was a 91

 

[UCSLugRacerX]

i have a 90 and when i did my timing belt my pulley wasn't in that great of shape, so i pulled one off my spare motor which was a 91

And did it work out fine?

 

[pianoman]

yeah works fine.