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Even though the transmissions were different, I would expect that you could interchange them between the two model years as long as you had the corresponding shifter.
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Very likely
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Since the M103 was used in some 201 cars, you should be able to use a 5 speed from a 201 with M103 engine. It should bolt up okay, but that will leave plenty of problems to solve such as driveshaft length and clutch master cylinder.
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The driveshaft will most likely have to come from a 124. The clutch master cylinder was the same for all 201's and it's probably used in all manual 124's.
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I personally would NOT do such a transplant unless I had the entire donor car that had escaped any previous salvaging, ready at hand for getting the zillions of little pieces off of that I would need to do this in such a way that it would not end up being a butcher job.
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Good advice, especially considering the amount of time it would take to get all the needed parts, most importantly the flywheel.
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Converting an existing car would be satisfying but expensive. A key thing to know is if the flywheel hub in an automatic engine would take a pilot bushing.
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Converting would be very satisfying, and if you can do the work yourself it'll be the price of the car and parts. The rear of the crankshaft in an auto 103 can accept the pilot bearing, if the trans. will need one there. The other possibility is for the pilot bearing needing to be installed into the flywheel, and you'll need to find a manual flywheel anyway.
BTW - no need to change the crankshaft.
IMHO, regardless of the shift quality or ratios of the 5-speed, the overall driveability of my 201 is much better with a stick than with the auto. I can imagine the 124 being greatly improved as well.