Tigercat 635D is 6 ft 6 in longer than Tigercat 620E — 30 ft 8 in vs. 24 ft 2 in, a 27% difference.
Tigercat 620E and Tigercat 635D stand about the same height, both around 10 ft 4 in.
Tigercat 635D weighs 9% more than Tigercat 620E: 47,250 lb vs. 43,200 lb.
Tigercat 620E runs 221 hp; Tigercat 635D runs 260 hp.
