Later on "cataphract" could also mean simply an armoured cavalryman, not necessarily on a barded horse. "Clibanarius" got equally vague pretty fast by what I know of it, although it usually signified heavier equipement.
Anyway, the problem with the vanilla RTW catas was that they were from something like very late Parthian or early Sassanid times, ie. nearly half a millenia out of date for RTW...
I'd peg the gear in the first pic of the OP to be essentially Migration Period or thereabouts chronology-wise; weren't helmets of that design popular around that time ?
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