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Most aerostars are 4.0's and ive heard that they have 8.8 rear axles. besides that i dunno. oh yeah, the 3.0 and the 4.0 have different blocks, the 4.0 shares its block with the old 2.9 V-6, which they bored and stroked to make it a 4.0.
The Aerostar had both the 3.0 and the 4.0. I don't know about the interchangeability of the two 4.0's in Ex's, and Aerostars. IT has an 8.8 however I belive its 28 spline and its narrower then the Exs.
I wouldn't be surprised if you could use some of the items off the engine. Same with the tranny.
The way to tell the 4.0 and the 3.0 apart is typically the 4.0 only came with the AWD version and the 3.0 came with the 2wd. Although I am sure there were exceptions.