A difference I have to note in my case, my first 2 vaccines were coronavac, made by the Chinese lab Sinovac. Meanwhile my booster shot was Pfizer’s vaccine
I had pfizer for vaccine and moderna for booster and thought the side effects were better for for booster (moderna). I'd be curious to know what others thought based on their mixing/matching.
I get my booster in ten days. My first shots were Pfizer, but the booster will be Moderna. I was a bit unwell for a day after my second Pfizer shot, but it was bearable. Hopefully my Moderna shot won't be any worse.