Have you ordered one now they are available?RR02 has the same caliber family as RR01. In addition it has an inner bezel. So it should have the room for this bezel.
According to Meranom site.
RR01 lower diameter 46mm, upper diameter 42mm.
RR02 case width 46,6mm without lugs.
And 56,3 with lugs.
Seems like placing the lugs to RR01 we will have about 56 mm (55,7?).
I suppose that the upper diameter should be bigger than 42mm. Again, because of the bezel, stored inside.
No magic here, RR02 must be bigger. A simple maths from elementary school.