I have seen sealed boxes of both these 1/72 scale kits, and wonder if the Trumpeter one includes a detailed bomb bay with ordinance? I cannot find any review of the 1:72 Trumpeter kit, but the 1:48 one does have a bomb bay, although no ordinance.
Review of Italeri's 1:72 Wellington Mk.X (no bomb bay details):
Regards, Gernot