Try using NXP taginfo on all cards / fobs you want to replace… if its high frequency it’ll tell you if one of the most common chips are being used. Easier / cheaper than buying everything and hoping one works.
the DT 125 kHz implant (xEM, NExT, flexEM mainly) emulates many many different types of tags including changing the UID… the main thing is checking readability and that it’s not a modern high security chip. Each implant can only emulate one card / ID at a time though, so some people buy a few (usually NExTs, sometimes xEM plus another HF implant)