Ah.. I thought you meant the latch where it connects with the body of the car. This is good news.
Rather than cut up original doors, it may make sense to keep an eye out for a set of earlier ones.
There is also the trim to consider. If you bolt on earlier doors to your 73+ car, they will bolt up but they all have the metal top where the 73+ doors had the plastic trim. So then you need to change the rear upper door trim to match. Not a huge deal but just something to consider.
I went through this with a 71 scamp, It had mismatched later doors from a 74.
