I versioned a user and got this

mIRC32 v6.16 K.Mardam-Bey

This is mine
mIRC v6.16 Khaled Mardam-Bey

is the first one a valid one for this version?

the 1st one is most likely from a program designed for filesharing on irc. mIRC doesn't give that reply so whoever is replying with that version isn't using mIRC.

ok, thanks
I'm in the process of writing a script to identify and kick spam bots and trojans

I'm also blocking invalid mirc versions