basically the cataphract is the earlier form of the knight

they usually had armored horses unlike most knights, but knights had plate mail and are from a later time period ... weapons were basically the same too ... except that obviously knights would have more "up to date" gear appearing later than the cataphract ..

Modern knight shoots cataphract with a crossbow, game over.

cataphract tanks it and fires a flaming arrow at the knights unprotected horse, killing it and then charges and makes pudding out of the fallen knight

There's a readon why they're an earlier form.

you saying the knight would win?

cataphracts were still being used btw ... the Mamluk heavy cavalry looks more like a cataphract than a knight

Talwar Khan wrote:

cataphracts were still being used btw ... the Mamluk heavy cavalry looks more like a cataphract than a knight

Knights are still used to, in the Vatican city.