Am American. To me, just casually, a noodle is a long pasta that can be spun up when cooked and pasta is a a smaller unit of the same food in another shape. So regardless of origin, I think of udon, spaghetti, and linguine all as noodles, but bowtie/penne/rigatoni etc as pastas. An exception are probably egg noodles, which are short but still noodles.