I've used cables marked as for campy. Shimano cables definitely don't fit though.
The point was, if you go to an LBS and ask for cables they will probably hand you some generic Shimano spec cables and they won't fit.
Generic spec derailleur cables can be 1.1 or 1.2mm. Both fit shimano. Your LBS should know this difference if you tell them either
a) a sram road brifter compatible cable
or more unambiguously
b) 1.1mm stainless drawn derailleur cable