ELI5: What would happen if all the Johnson & Johnson vaccine doses were replaced by all the Moderna doses?

I cant understand Johnson & Johnson because they aren’t very good at doing math (16/10 would not recommend). <br><br>I cant understand Moderna because their numbers are so large they need to be written in scientific notation (they’re a little bit too smart for my dumb Johnson and Johnson brain).<br><br>What would happen if both companies had their doses switched?