.prt inserted in Assembly - Color in Assembly different than actual .PRT file color
Kaci Beaber - See below
Awesome ! it worths thousand of words ! as I planed to explain the question
in addition to what John Stoltzfus said, the lighting and/or scene is likely different form the part file (.sldprt - .prt is the ProE/CREO file extension ) to the assembly.
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