Most skirting boards confirm to one of about 8 profiles
(Handy guide to some of them)
The bad news is that while it is easy to find an approximate match for most skirtings it's actually very difficult to find an exact match as radiuses (radia?) Change depending on the material they're made from and the method of manufacture and if you don't have the tools to produce a specific radius it's gets very expensive very quickly (spindle moulder bits ain't cheap).
The good news is that if you can find an approximate match most people dont notice the fact that profiles aren't exactly identical, especially if they meet at a corner.
TLDR depends on how anal you are Vs how deep your pockets are