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Hi @Cek .
there are several strategies or functions to use here.
I think, You can not design any two different parts so, that two different faces can hold one and the same relation without any additional function in use.
But the relation wizzard or the steering wheel are really great tools with very less operations to do.
One thing you can always do, is instead of designing you second part from scratch, if you did a save as of the first part and then only modified the geometry that was already there, only change the dimensions, then I believe when you replace one with the other it should keep those relationships without isssue.