These names are years apart. In some cases even over 15 years apart!
If one don't have too many typos, one is bound to get the right cards anyway, so it's really not much of an issue (if at all).
I mean if one can't see the difference between Radeon X5700 and GeForce FX5700, over half the name is different 🤣
In The Netherlands we have a proverb for something like this: Van een mug een olifant maken which roughly means to try to turn a mosquito into an elephant (meaning making a problem bigger than it really is).
However, what is confusing in manufactured cards (which is not mentioned in the OP, but perhaps should have) is the cards that are from the same family and have the same or very similar model numbers, but are vastly different in performance like the different iterations of GF4MX and GF2MX (just to name a few), of which there were versions with 64bit and with 128bit memory bus, but also with either SDRAM or DDR. Making a budget or castrated card and naming it as if it's a midrange or topline card. That would be really deserving of a rant 🤣