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Do they have movement reference numbers on the caseback? You might be able to look up the specs / dimensions, eg on Caliber Corner:
https://calibercorner.com/category/quartz/
New one apparently uses a Seiko PC33. Old one is likely a Timex-made movement (internet suggests an M138) so probably quite different.
Regal
I’m confident they won’t be the same quartz movement 40 years later.. I just wondered if they were sized similarly enough I could make it work. The date wheels are definitely the sticking point.