Probably not. With how rigorous the quality control is for this kind of stuff, it's just not possible for them to manufacture wildly different formulations from what was approved. They'd all get shut down, quickly.
We got those standards because of various fuckups over decades.
But what you can do is you can buy just one dose from any place then send it off to a lab to get analyzed. Ensure you follow extremely rigorous chain of custody processes so no one can say you tampered with it.
Tell us the results. This will cost you $600 to do.
If you want to mass analyze, you'll have to buy from batches all over the US. Could cost thousands to do an independent assessment.
Get one of each named company's shot to determine if they are using the population as an experiment.
If they are doing it, they would differentiate the tested substances between multiple entities or faces each with their own layer of separation from the original decision.
This is how those really in charge operate. Multiple shell companies and redundancies so your grievances if ever "resolved" never hurt the true decision maker so nothing really changes in the future because the company that got hit was just a pawn.
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