This almost happened to me, I had signed up for an appointment online and they only had the Pfizer shot. But on the day I went to my appointment, they got the Moderna version in. Literally that same morning. I lucked-out.

I always get any vaccine I can whenever it's available because it makes me feel like I'm leveling-up my body. Like an RPG. I know that's probably a bad way to think about it, but I can't help it.