>Can patch cables be either pass through or crossover?
Patch cables are shorter straight-thru cables. The spec recommends stranded core wire and no longer than 3 meters. In this regard, I and others don’t always do what the spec recommends (I do make cables that work). Straight-thru cables can be “patch” cables or a cable that is usually longer, such as “horizontal wiring” between a wring closet and a “work area.” Crossover cables are crossover cables.
>I thought if it was a crossover cable it should be labeled as such on the outside.
It would be nice if all of them were. Mine aren’t. Using a different color may also be useful.