Only very very rarely. Due to the nature of Grassblades, I can't really do it a lot; I think it's a technique that lends itself better to gag-comics.
I do sometimes have bits of conversation where the characters remain in the same positions/with the same expression, which means I can copy the sketches and/or inks at least, but yeah. Not that often. I do it occasionally with backgrounds, too - if the characters remain in the same environment (say, inside a particular room), I will on occasion copy a background - but again, not very often. I tend to change camera angles a lot, so it's not always possible to do it.