That’s not the difference the parent is asking about. He’s asking if the adenovirus based vaccines available are meaningfully different.

Reaching beyond the parent’s words, both AstraZeneca and J&J have now had issues with blood clots. If it’s a similar formulation then perhaps you’ve found something and Adenovirus vaccines with a different formulation are unaffected. If they’re very different then perhaps other variations of Adenovirus vaccines need more attention.