Victorian hinges were made long before standards existed, so as you may suspect you won't just find a new hinge to match your old hinges. There are a few sources of reproduction ironmongery (generally in brass and bronze), but they are IMHO ridiculously expensive in the main and again may be based on different patterns to your ironmongery. This is because almost every town of any size in the country seems to have had their own foundry, or more than one, and these places always seemed to produce a vast range of products including hinges. Hence the variation. That being said, personally I'd try the local architectural salvage yards or maybe local pine furniture places (the sort of places which advertise themselves as "upcyclers"thses days
), local antique shops, local flea markets, etc. You may be lucky, you probably won't. Note that I emphasised the "local" - because products often were made locally until well after the railways became a national network.
TBH, the quickest and probably best solution is to buy either modern equivalent (repro?) hinges from an architectural ironmonger.
Incidentally, if the hinges are still up to snuff and doing their job you might like to consider adding two or even three modern hinge bolts to beef up security. Low cost, relatively unobtrusive and widely available
