As far as I can tell these are identical components, but the store has a 3 month lead time on the Form 3 build platform and in-stock for the Form 2 platform…
I believe the Form 3 BP has a way of making sure the printer knows it is installed. Its almost like a pin that gets pushed down. So the BP for Form 3 will work in the 2 as well, however I am not sure the Form 2 BP will work for the 3. I may be wrong though. I know that the Form 3 does recognize when it has a BP inserted or not and wont let you print until it recognizes one.
There is a pin switch on the Form 3 but both platforms trigger it (i am using old platforms on my Form 3 now), see picture.
The build platforms for Form 2 and Form 3 are identical. Thanks for catching the issue. Our web store team will correct the lead time.