Modern shift cables do not card what type of bike they go on. THere is no difference between MTB and Road for shift cables.
This is generally true, but not universally so. Not to pick nits, but some older downtube and stem shifters had a transverse head on the cable, and so called universal cables do not fit all road shifters. MTB cables are universal for MTB and MOST road shifters, and those are the ones that fit the shifters in question.