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Note the two different screw patterns. In addition, both the clip's patent stampings and the tang stamps on the blades are different. Gentleman who sold me the one on the right below noted that the one on the left has asymetrical scales, like the paramedic, with the one on the clip side being thicker. The one I purchase has relatively thin scales on both sides (approximately the same thickness as the unbeveled portion of the beveled scales on "late model" Workers).
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Questions that come to mind are, which came first, which was produced in greater quantity, and, aside from the Evolution Set remake, are there any other distict 2 screw variants.