Vintage Rolex Tudor Restoration Query

[Broddy]

Hi,
First time posting.
I have a Tudor sub that’s been in neglect for many years.
There is a fair amount of rust in the movement.
I have found a great working Tudor movement of the same caliber.
My query is, am I better to just have the original movement replaced with this second movement or should I have the watchmaker salvage whatever parts he can of the original movement. For example, any parts that are branded or have serial numbers etc.
Cheers!