It's not entirely the same. The Pfizer, Moderna and J&J (and Novavax) vaccines adjusted the protein to present a more consistent target than the viral spikes:

It's not entirely the same. The Pfizer, Moderna and J&J (and Novavax) vaccines adjusted the protein to present a more consistent target than the viral spikes: https://cen.acs.org/pharmaceuticals/vaccines/tiny-tweak-behind-COVID-19/98/i38 https://cen.acs.org/pharmaceuticals/vaccines/tiny-tweak-behi...