Yes, they are otherwise identical (except for the price, offcourse). I also can't find many differrences between an ordinary 'new QL' and a 'QL GIII' (except for a different rewind crank). If there are more differences, they must be under the hood or in the manufacturing proces. The 'new QL-17' and the 'QL-19 GIII' don't show up as often as the 'QL-17 GIII' or the 'new QL-19'. I don't know the reason behind this. I hope to be able to compare all four one day.
Wim