Dunno.
The Mark IV was getting a little long in the tooth and the Mark III was obsolete for anything but an assault gun chassis.
A simplified Panther and Jagdpanther might have been a good idea.
Problem was, the Panther the Germans built was larded up (which started out as a German T-34...) with gizmos inleaved road wheels and they couldn’t build them fast enough.
Tigers, though, were a waste of production lines and steel.
Russians ordered that captured Panthers and Tigers be used until they broke down and then be abandonded. However, captured MK-IVs when broken down were to be repaired and returned to service.
Also, MK-IVs were still showing up on mid-East battlefields as late as 1973. Not the case for Panthers and Tigers.
The French and several Eastern Block nations used captured Panthers through the late 1940s but only until inventory of spares parts had been used up.