I think you're talking 37 only?? At a quick glance, there appears to be two differences. The Autolite reg needs a ground from generator, the first Delco shown does not, second Delco has a place for the ground but if schematics correct, doesn't actually need it. Then there is a physical difference in terminal layout on the regulators. Having the ground and allowing enough pigtail for the various terminal locations would seem to be the major difference.
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