Replace '40 Sedan Trunk/Chain Box?

[alt63bird]

I'm trying to wrap my head around the rot in the floor pan and trunk of my '40 Tudor. I want to do it right and use pans with the correct embossments and contours, not go the replacement/street rod/sheet metal shop bend-on-a-brake route. Floor pan seems simple enough - either patches or full pan replacement, but the trunk's another story. My trunk has the usual rear pan/chain box rot, along with the spare tire well. With the repop coupe trunk pan you don't get the spare tire well which the sedans have (and I haven't found a patch panel to fill the hole in the well-yet). But the tool/chain box is what has me baffled - is it the same shape/profile for both coupes and sedans? From what several ads say it should be, but I'm suspicious. Would a model 77 (coupe) trunk pan work in a model 70 (tudor)?