Do innies gain knowledge their outies learn if it isn’t personal?

Do innies learn new things that their outies learn, if it isn't personal information? For example, we see that Dario R. has limited knowledge of English... does he effectively have to learn English twice, or do new words and grammar he learns on one side pass through to the other? Another example is the word throuple, which is a word that got popularized recently and seemed to throw innie Mark for a loop despite it being pretty well known in the outie world (presumably).