I had to go borrow a neighbor's magnifying glass to look more closely. I think the basic construction of the snaps is probably the same, but perhaps different makers. The holster could be the same, hard to see for sure.

I looked at a few others and there is some variation between them with some showing more like yours and other showing more like I described. Seems like earlier ones the "center male" is more pronounced. Probably not a bad thing in most circles.

The Johnson baby dot sometimes gives the impression that the male portion is one piece to the naked eye. The snap on the old Heiser sheath doesn't give that appearance to me. Looks like you can tell it is two pieces. The "one piece - two piece" male is probably a poor choice of words to describe them. Just trying to differentiate between the two.