Yes the TC RS 12" cabs 1x12 or 2x12 are deeper than the 10", so the 10's on top sit further back... there's some science time alignment jiggery pokery behind why that works.
Saying that I had the 1x12 as well as the 2x10 and for the hell of it I moved the 10's flush with the front; no discernible difference that my ears could hear.