My bother had 103.4 with his second moderna shot. I had him take some tylenol and it dropped to around 100. He felt like crap for about 24-36 hours. He had no reaction to the booster though.
I know a few people who did mix. No one with a reaction like that but it's not uncommon for either brand. Take some tylenol. It should bring down your fever and help with the aches some.