Autolite Voltage Regulator Part Numbers

I have a worn out Autolite 12 volt positive ground VR on my Massey Harris with part number VBP-5201A on it. I'm searching for a replacement and found one with part number VBP-5201B on it. What is the difference with mine having an A and the other having a B ? TIA
 
Wilson TA 781 replaces A and B as well as 4201a. I can not tell you the difference or the one you found will work for your application.
 
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