Hard to guess. Likely worth investigating, but as secondary priority: 1. You may end up just getting very short and weak immunity, making this approach ineffec

Hard to guess. Likely worth investigating, but as secondary priority: 1. You may end up just getting very short and weak immunity, making this approach ineffective. 2. You may get a combination of immunity which can have different efficiency. 3. For some vaccines of same type this works, but is rarely recommended. 4. Mixing partly mRNA and Adenovirus vaccines doesn't to be winning strategy. It is rather more likely to give another vaccine if after two doses you didn't get immunity.