what do you mean? i'm 99% sure they're completely different products. the 619GL is the motorized in-dash foldable touchscreen unit, and the 629 is just a regular 7" touchscreen that you'd stick in a headrest, or flushmount into a dashboard.
on that note... I've had two of the 619GL's (motorized in-dash)... horribly built cheap products, I don't recommend them at all. While the USB control is a whole lot easier for connectivity, the headunits with serial cables are much MUCH easier to program for. Xenarc was supposed to come out with a unit around a year ago, I've tried their screens before too (not vga though)... maybe look into that if you can.