I am sure the parts people have cross referenced your trans.
exchange for fit.
It is quite common to see a part # from one chassis that fits another. So to see a 201 part prefix when you ordered a part for a 124 chassis should not be of concern, as there are many interchanges right from the factory.
The concern on many trans is some are 1st gear start and others 2nd. This involves different valve bodies and parts, so that is what you want to know. [ this is not the case with yours as all 722.4 's are 2nd gear start]
A quick inquiry with your parts guy will probably put you at ease.