Cosmetic parts and interior parts are very interchangeable 89-93 but style may be different so there is a lot of potential for customizing to your own taste. There are basics such as the front bumper. The ones with a larger front inlet are GVR4, 93 LS bumper which deletes fog lights or JDM (possibly Galant GSX don't know). DOHC cars are most compatible in engine bay but the engine has several differences CR, cams, piston skirt oil squirters, injectors, throttle body, power steering pump which many think is an upgrade, and more. Honestly, a great many items are compatible but have subtle issues. If you see something you like on a different year/model but are not sure will fit, ask the board, probably someone will get back to you quickly.