The helmet is similar, but other than this the TAB is simply a maxed-out thorakitai. The helmet was actually adapted so that the model could be used for the Dosidataskeli and their Goidelic equivalents. The original model had a legionary-like helmet with a chainmail veil.
I understand why some people call them foot cataphract, but this has given others the idea that TABs were somehow inspired by cataphracts rather than being an independent development.
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