In the greater scheme of things, none of this really matters. The whole purpose of searching out "lost" or "previously unknown" versions of MacPaint is to find something no one has seen before. But you won't find anything shockingly different from between those earliest of versions. No, for that you would need to lay your hands on the special version of MacPaint that Bill Atkinson wrote to allow editable text:

http://www.folklore.org/StoryView.py?project=Macintosh&story=MacPaint_Evolution.txt

You can even see my comment at the very bottom of that story. I really wanted a copy of that version of MacPaint! So I wrote to Bill Atkinson himself a year ago to ask about it. To my delight, he wrote me back. But to my dismay, he said he didn't have a copy of that version nor did he seem inspired to guess where one might be. Knowing how odd programmers can be, he might have deleted it back in the 1980's, for the reasons given in Andy Hertzfeld's article.

So when I see threads about folks searching out different versions of MacPaint, I am always reminded of that one special version with "editable text." Find that, and you have found a treasure indeed.