you may be able to use Pickup 22re oil pans or 4runner oil pans but those may be different, not terribly sure. i havent looked into it
The sump position for the trucks will be different, as the pan needs to clear the front axle. 2wd trucks, not so sure. They might still be different due to crossmembers and such.
So you'll most likely have to find one from a Celica.
Also, there's lots of parts that are going obsolete for our cars. For the GTS, you better pray the rear wheel bearing are OK. They need a crush sleeve to reinstall and Toyota stopped making them. The rear right caliper is not available anywhere anymore either, and I just looked locally for rear brake lines for the GTS and they either had the inner or outers but not both.
These cars are getting harder to repair...