1) Nope, they are functionality wise identical 2) We are working hard towards a full availability of the Nitrokey 3 in the near future(tm), although we aren't there yet, so it is hard to predict, when the best time will be for you to order. Currently (as the FAQ says: https://docs.nitrokey.com/de/nitrokey3/faq.html) we plan for mid-22 for the OpenPGPCard functionality to be available, but this is still not certain. But we have some hopes that until then we will be able to ship Nitrokey 3s w/o delays...