1970 Coronet Seat Cushions/Bun VS. Charger Buns

I've been told for years that the 1970 B-Body Bucket Seat Cushions/Buns are the Same for the Charger, GTX, Coronet, etc. The only difference is the seat Covers. Has anyone switched covers onto a different Model's Seat?

Thanks

I've got a set of 70 Charger and 70 Bee buckets and to me they look same.