No, the current boosters are the same vaccine as the original vaccinations. The booster shots are given as the antibody count in your blood drops over time and

No, the current boosters are the same vaccine as the original vaccinations. The booster shots are given as the antibody count in your blood drops over time and the booster shot keeps them at the maximum for another half year or so. We don't have precise data about the required level of antibodies to stay healthy yet and in quite a few countries the infection rates are currently high enough to pose a real risk for vaccinated patients in the vulnerable group. The safe play is to give booster shots to keep the immune response at its best.