Depending on the program, there can indeed be a significant difference between exporting and ‘saving as’. For example, Excel will export as a csv in the standard format just fine, but if you ‘save as’ csv it’ll come with extra formatting symbols specific to Excel that’ll wreck attempts to use it in other programs that don’t handle for it.

As someone who has studied it, have fun with that. While that poem is an outlier, there’s still a ton of things that not even inflection or context can solve.