If we need an in-universe explanation, it could just be that we see Cecil being a bit more active and hands-on in the show.

If we go with a real-life explanation, it may have been to better match the physique of his voice actor, Walton Goggins, kind of like how a handful of characters have been race-swapped to match their VAs.

In my head, though, it seems most likely that it was just an arbitrary artistic change.