Let's take a moment and clear the air just a bit...
First off your Registration # and your Part 107 are not "linked" in any way what-so-ever. You can have a Part 107 and never register a sUAS under Commercial. Many people have their P107 but they fly a company/dept sUAS so they never need to register themselves. If you "change" from Hobby to Commercial you'll need to go to the FAA Drone Zone and get a new Commercial/Non-Hobby Registration # and apply it to your aircraft (remove hobby #). Both CAN start with FA#######
Secondly if you fly your aircraft even only for a SINGLE non-Hobby flight (Commercial, SAR etc) it must have a Registration # from the FAA within the Non-Hobby section (not 336). Non-Hobby registration #'s are unique to an exact aircraft (if applicable tied to a Serial #). In contrast Hobby registration is for the operator and the SAME Reg# can be placed on ALL sUAS that are flown strictly for hobby. For instance I'm fortunate to have over 25 sUAS in my "stable" and 22 of them have the exact same Reg# (Hobby) on all of them. I have 3 that "might" fly for non-hobby and they all have their individual/unique Reg #.
A Non-Hobby aircraft (Commercial, Govt etc) could have an N# or an FAA#. As stated above you "CAN" go the N# route but I highly suggest NOT going that route. It's a lot of paperwork, a lot of time, and a lot of HASSLE if you sell, give away, or lose your aircraft. It involved several forms, signatures, and a NOTARY when you can do the same thing (same price) in a matter of seconds at the FAA DRONE ZONE!!
It's important to note that an aircraft can only have ONE Reg# displayed on it. If you initially registered as HOBBY and then later decide to go Commercial simply remove the Hobby and apply the Commercial and be sure to carry your new commercial pocket card with you.
- Commercially Registered Aircraft can be flown for non-Hobby and Hobby flights.
- Hobby Registered Aircraft can ONLY be flown for Hobby flights.
I’m not sure the type of drone registration matters for the registration number. I have a Part 107 certificate, my drone registration number begins with FA, but I fly this drone basically for fun. They have no idea that a drone is going to be flown for recreation or profit, and I don’t think (for registration purposes) they care as long as they get their $5.
Ummmmm yes they do "Care" and it's part of the REGULATIONS so we should all care as well. If your aircraft is flown for Non-Hobby flights, even only ONE time, it should have a Reg # that is issued from the Non-Hobby side of FAA Drone Zone.