There's an upper and a lower spring on the top hinge, but other than that, they're (as far as I've ever known) the same. Suggestion: if you can weld, close those original holes and then re-drill them...or at least partially close them and re-drill. They get wallowed out over time and that's what lets the springs go MIA in the first place. You can even braze the holes and re-drill, because these hinges are not getting the same amount of use as they did 40 years ago. Anything that restores those holes will help.
Another note: I've bought springs from 2 different vendors (not Jim Carter) and both were slightly different. One was clearly made in Taiwan. One was made somewhere else. The length of the ends that fit into the hinge were what was different. The ones from Taiwan were a bit (maybe 1.5mm) longer than the others.
