>>7936899Height charts 100%, but I don't think we have got one for the GF. Title pages on the otherhand I consider more artistic since there's no perspective and I think a lot of the time they a drawn to look appealing without scale being a consideration.
That being said, their first appearance in the manga appears to match this title page, so my assumption is they started off this size, but Toriyama made them larger as the Namek saga progressed. A bit like he did with Piccolo.