i think they are both the same but different tech. but both react in the body the same. my oldest had to get it for work and she got the moderna one and the second one fucked her up bad. we had to keep my grand baby because she had a fever cough and the whole 9 yards for a couple days. not to freak you out about it and i am not an anti vaccer at all and if you are at risk i would damn sure get it. a friend of mine on active duty got the virus early on then got the first dose of vac then got brutal sick on the second one. 2 months later he was in the hospital bad off from catching the virus again. it is insane at how different it affects everyone.