AA-, G-, and J-body fuel filler tubes the same?

[jeffhambone]

Subject nearly says it all. Are the fuel filler tubes for AA, G, and J bodies supposed to be the same size and shape? I've got a '91 Daytona that I'm replacing the fuel tank on and the original filler tube is in pretty bad shape. I've got a spare from a '91 Lebaron. They look almost the same but differ slightly in a couple of dimensions. If the one from the Lebaron won't work, I should be able to find one from an AA body pretty easily.

I suppose I could just slip it all together and see, but thought I'd check to see if anyone else had been down this path before. Those filler tube sealing gaskets are a PITA so I'd only like to have to do this once....