Contacttower,
I am embarrassed to say I don't really know what effect it has, except to say not much.
This isn't just bravado; and I'm not claiming a demonstrated x-wind limit should be lightly ignored. It's just that I started cautiously when I transitioned to the Seneca 1 (my first twin type) and it was never a problem to land in strong crosswinds, not even close to a problem. Being safe in a light twin demands all sorts of things (eg. recurrent training in single engine drills) and the x-wind thing just wasn't on that list of demanding things.
rgds
421C