Even if they do make *big* changes, there's still all the minutia (beyond battery, motors, skateboard, wheels, which are biggies).
Ventilation system, heating, cooling, brake hydraulics, accelerator pedal, brake pedal, centre console, screws/bolts/fasteners, rear view mirror, courtesy light, customer support system, supercharger support system, delivery logistics, supplier logistics. I've only scratched the surface. Tesla would have gone through the entire parts catalog to see what can be used again. If it's not over 60% I'll eat my hat.