Well, it looks/sounds like they are made by Williams, who makes Snap On. BUT- that's alot different than saying they are re-branded Snap On tools. I'd be willing to bet that the wrenches in that other thread (New Holland branded) were marketed by Williams, but I think if they are re-branded anything, it's probably Blue Point. And the fact that they are not marked with country of origin makes me question the sellers statement that they are USA made. If you look at SO's website, many of the Blue Point hand tools are now made overseas- whereas they used to be mostly made in USA, maybe 8-10 years ago.
Seems like lots of tool sellers, especially on Ebay, try their best to tie their tool sales in with Snap On, no matter how strong the connection really is. Let's face it, the Snap On name is well respected and will likely increase the $$$ that a tool sells for, if the buyer buys into the fact that the tool they are buying is somehow connected to Snap On.
Until someone comes out of the woodwork from Snap On, I don't think you're gonna get a crystal clear answer to your question.