I suggest you go buy 15k cartridges and don't bother with plugs - you don't deserve your ears. I would give a nut (as long as it was a dud) to have lived through the 80/90's music scene. Best music ever! 😂
I have no idea of the age of either of them, though I would presume the current one is newer in line with steel proof marks. Good guns though. Physically, there is absolutely no difference other than a stamp as far as I can tell.