I don't know... ... I found it odd that a mass market, off the rack, hybrid would come stock with 180mm cranks so I've spent too much of a nice Saturday morning chasing down bike models and Shimano crank specifications. As far as I can determine, the Fuji Absolute 1.0 has 170mm cranks and they are indeed FC553 road triples. I also found it odd that a road bike with racing pretensions like a Roubaix would come stock with 165mm cranks. Here I have less luck with obtaining hard numbers, the Oval 520 compact double that comes stock on that bike does not list a crank length. I would ask the o.p. to measure both their cranks again, using the center of pedal spindle to center of bottom bracket convention that is pretty much standard and report back.

Other may differ, but I for one switch back and forth between 165mm, 170mm and even 175mm cranks without any noticeable discomfort. I try to have 29.5" to 30" between the center of my BB and the top of my seat and I let the crank length sort itself out. I used to measure from top of pedal surface with the crank in alignment with the seat tube up to the top of the saddle. Keeping this dimension constant will somewhat compensate for different length cranks. FWIW.

H