Yeah the guidance changed when it became official I was somewhat mistaken, it also got way more complicated. Pfizer booster is same formulation, same volume, same dose 6+ months after second shot immunocompromised and regular. JnJ is same formulation, same volume, same dose but better is to mix with a mRNA vaccine and that is 2+ months after first shot. Moderna is same formulation, same volume, same dose for immunocompromised but same formulation, reduction in volume, thus reduction in dose regular. Then Pfizer’s approved children is different dilution formulation, volume and dose which will be designated by a difference in vial cap color. As usually making things as complicated as possible, but more behind the scenes than anything else.