Spiral,
I know enough about cartography and the bewildering complexity that is/was/shall be Burma's ethnic mixture to know that vouching for the accuracy of any map, especially without explicit parameters laid out, is a fool's errand.
Take for example the Shan States. Sounds easy enough to define but...well, like I said, a fool's errand. If you really are serious, I would suggest finding a copy of Martin Smith's "Burma: Insurgency and the Politics of Ethnicity" and read and chapters 2,3,5 and 16. It certainly won't answer your questions, but it is certainly more concise and informed answer than I'll ever be able to give you.
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