That's not strictly true.
This was the first FDA-approved mRNA vaccine, so it is "different".

Pfizer’s COVID-19 vaccine is the first mRNA product to achieve full FDA approval in the U.S.
That's not strictly true.
This was the first FDA-approved mRNA vaccine, so it is "different".

Pfizer’s COVID-19 vaccine is the first mRNA product to achieve full FDA approval in the U.S.