No they are completely different. The Starion is based on the 4th generation Galant floorpan and has narrower rails due to being from a RWD vehicle with a larger trans/driveshaft tunnel than the FWD/AWD Galant. The Starion seats are used to swinging right forward due to the rear seats so the lever may get in the way in a four door sedan and the function will be completely useless.
Is it leather you want specifically? In my opinion the cloth seats found in the GGSX and the JDM VR-4 (other than Super VR-4 and Monte Carlo VR-4) are far more comfortable than the leather VR-4 seats, especially the rear seats!