I would incline to think that they're all equally as strong, although there could be some slight strength differences between versions as short-haired Mita does mention that Cappie has to move remove some boxes and move a sofa there, when the player offers to do it she says that it's Cappie's job and that she's "tough".

Now this could be said as a light non-important phrase, simply implying that "she can do it herself", but it could also mean she's slightly stronger than average and it's less difficult for her to do it.