Joe, I've never seen any low shank overedge feet that are made like the Singer slant shank ones (wire on the right side, etc). I DO have the Singer slant shank one that's NOT a snap-on...& the overedge cam that is used with it.
But all the low shank ones I've ever seen are like yours (& the one at Nancy's Notions). mine might be the exact same foot. I like mine MUCH better than the Singer ones. Seems to keep the stitches (& fabric) flatter.