Deere 768L-II is 2 ft 3 in longer than Deere 748L — 29 ft 9 in vs. 27 ft 6 in, a 8% difference.
Deere 748L and Deere 768L-II stand about the same height, both around 11 ft 0 in.
Deere 768L-II weighs 20% more than Deere 748L: 52,245 lb vs. 43,460 lb.
Deere 748L runs 263 hp; Deere 768L-II runs 281 hp.