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No there is no difference. I did the swap in my 92 f150 along with 2wd-4wd conversion and the only thing that I needed to do was remove the cover for the t-case shifter.
Even if there is a gasket, there is no fluid between the two thanks to a rear seal in the tranny and the front seal on the transfer case. I just used rtv silicone to keep the dust out and help the treads seal on the bolts, as I know they go into the fluid chamber on the old 205 t-case, which I used in my conversion.