+1,
Campy heads are a bit smaller. When I ran Campy's east coast service center I had a steady volume of levers sent in with the old cable jammed into the cam. it was enough that I ended up making a small tool for the express purpose of pushing the jammed heads out.
Regardless of markings test the fit by putting the head into the pocket for it backwards before treading the wire. it should fit absolutely freely. A borderline fit that's sort of snug will bind later on because corrosion swells the zinc head slightly making a kiss fit into a jammed fit.
While you're at it, dip the cable head in grease or oil to make your life easier when you go to remove it a few years later.
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