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For my 4.1 buildup I brought both the 4.1 flywheel and the 3.8 turbo flywheel to the machine shop. My builder went with the turbo unit. I'm not aware of the differences but I know the turbo pistons were heavier than the NA 4.1 pistons. Don't know if that makes a difference.
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84 GN. 4.1L girdled with 8.5:1 JEs, 212-212 Comp Cam, GN1s, Ported stock intake, Ford FM IC, 6765DBB, KB headers, Cotton's 3" DP, Innovative Turbo Systems external gate, 60lb injectors, Turbo tweak chip, and a few misc things. No times with new combo yet.
06 Acura TL daily driver.
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