I thought DGLE was what modelers call "Brunswick Green".
As far as I know, Pennsy locos were never painted freight car red. It was either DGLE or Tuscan.
And to the point that different batches may be different from the same company, remember this is an industrial operation, not an art show. What I mean is that the paint was to keep the equipment from rusting, because that is good business, not to look pretty. Some guy in accounting ordered the paint and had it shipped to the various paint shops. The shops probably got it in 55 gallon drums. They opened it and used it. The most likely did not bother with comparing it a paint chip or anything else. Whatever was in the drum, they used. Think of it like that safety yellow and industrial green we saw so much of the plants we worked in and around. Lots varying shaes, but it covered the stuff it was supposed to cover.