Of which there are none because RS-422 is not a protocol. And if you’re talking about MIDI the electrical interface part of the spec (ie what can actually be compared to RS-422), not the protocol part, it is a point to point isolated current loop system - it is hard to be much different than RS-422 a differential voltage multipoint system.
That you can run the MIDI protocol over RS-422 is no more notable than that you can run it over smoke signals or semaphores.
In practice almost every common short to medium range interconnect has been used commercially for MIDI at some point, including SCSI, Ethernet, bespoke fiber in addition to what was already said.
