Happy Easter 2U2!
If I understand your first question, then
this thread may be what you are looking for.
Second question - The width of the 61 & 62 frame is WIDER than the 63 - 66 frame. The bed is the same BUT . . . . the bed support crossmember holes will not match up to the frame. You will need to drill new holes. (Disclaimer: I have never swapped beds. I have only read about it.)