... some say that tools can have the EXACT same model #, but be different and only way to know is the SN. THOSE are the tools that I (and I think k0ua) would like to see compaired. And NOT something with a similar but slightly different Model #
Yes, that's EXACTLY the issue under discussion. I thought virtually all agreed that slightly different model numbers of the same tool might well be an indication of different components.
But if model #123abc of Tool X purchased from BigBox, was found to have different components than Tool X with model #123abc purchased at Grainger e.g. there would be smoke coming from the proverbial gun...