When ordering on the internet do i only look got "gt4/alltrac" or will the mr2 3sgte parts work with the celica 3s?

its all the same .

Most parts are interchangable. However, you should search by what generation engine you have.
For example: If you have a 2nd gen 3sgte, you should search for 90 to 93 parts. For say like an intake manifold.
Or, 3rd gen 94-99. Just do your research before you buy something. Double checking your information is better than buying something twice.

and be careful of turbo kit, intake manifold, and exhaust manifold.
Some of those work with MR2 but on on Celica.
Some interfere with the alternator bracket, firewall, hood, etc..

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Ive got a wastegate actuator for a mr2 and an alltrac. Thay are exactly the same.