They are wholly independent from the protocol or interface. Ghosting is an electrical issue that is a result of keyboards being a bunch of switches arranged in a matrix. It makes the keyboard’s controller register an extra keypress in certain conditions. Nothing to do with how the thing communicates with the host computer.

Key rollover issues can be related to ghosting. The limit for it is once again the keyboard’s design at the circuit level, not its communication protocol.

Really they’re both related to how cheaply built the keyboard is. That’s the only thing.