Electro 12 transmission replacement

[formariz 11,988]

Will a transmission from a 1972 Charger 10 automatic work as a direct replacement for a 1969 Electro 12? On the exterior they look identical. I want to get a spare in the event I need to replace mine in the future.

Any input greatly appreciated .

[ol550 830]

Get-R-Done  both used the 90-2046 Sundstrand hydro.