Are they both 10" lathes and are they the same bed length? I believe there are a few different versions of the QCGB's, but I don't know what all the differences are. The one pictured appears to be missing a lever? I think you would also have to add the tumble reverse to your lathe and potentially swap the leadscrews.
I thought about looking for a QCGB for mine, but the prices for just a QCGB are astronomical. If you can pick up the whole lathe for a decent price, you can probably part out the rest to cover the cost. Although it does appear to be missing parts on the carriage.
I came across the E-leadscrew project and figure i could fit that to my lathe for about the same cost or less than the qcgb and it would give more functionality for the price. Thats probably the way I will go when I get sick of the change gears.