Is this an odd '67 Dart Voltage regulator?

For the last week I've been trying to track down a parasitic draw in my dart that would cause a dead battery overnight. After doing some detective work, I finally tracked the issue to the green ignition wire coming from the Alternator and going to the Voltage Regulator. I'm 90 percent sure the issue is the Voltage regulator and here's my reason but also concern regarding why. The previous owner of the car installed a regulator that doesn't look like the standard Mopar box:
https://www.summitracing.com/parts/smp-vr101/year/1967/make/dodge/model/dart

Or

https://www.napaonline.com/en/p/MPE...j-ZxxvFEvSka3KV_MhwUmh1W0Q8hLcXRoCr8wQAvD_BwE

Instead, it looks like a Ford box. Reason I know, my kid has a 68 mustang and his Voltage regulator looks just like it, down to the connector plug wire. We did a test and swapped the box from his car into mine and sure enough it hooked right up and after checking with a test light and multimeter, the parasitic draw is gone and the car starts and runs great, so far. The final test we're running is leaving the battery hooked up overnight to see if the car will start in the AM. This is where my question/concern comes in, why would someone use this Voltage (pics attached) Regulator instead of a mopar unit and is this a huge issue that should be looked into and remedied? Am I mistaken and maybe Dodge did use a similar VR box? Thanks all

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