Tim,
I just thought of where I've seen this before. See page 78 of the Dolzall's book, also unit #51. I guess there is no way to answer your question unless there is a builders photo out there? I would put my money on both being the same. I can't imagine them delivering the units at different times and if they were delivered at the same time, them having different paint.
I am surprised to see that they only had one unit on the Indy train. Not that the tonnage would have called for it, I just haven't seen a Monon train in the 40's like that.
Regards,
Mike