There are lots of minor differences on the US made 201-2s. I have a 201K23 with threaded spool pins (1955), and I guess the later 201s might have been given a threaded spool pin. I have seen slight differences in finish on spool pins, some are silvery chromed, others look more like nickle finished metal, with a slight yellow tint to the shine. Make sure the new spool pin goes in the right hole, and not one of the oil points. Here the potted motor is few and far between compared to belt driven versions, but yes, I have replaced a spool pin on my black cast iron 201, the top one was missing. It can be a bother to buy new ones, I had to order a used one to get the right tapered end.
If your 201 has a flat chromed plate under the spool pin it's probably takes the tapered type, I'm guessing the versions that has the round metal parts embedded into the body takes the threaded type.