That only means they have an exclusive right to manufacture the vaccine. It doesn’t mean that the details are secret.
For example: https://github.com/NAalytics/Assemblies-of-putative-SARS-CoV...
Btw, sequencing of both mRNA vaccines:
https://github.com/NAalytics/Assemblies-of-putative-SARS-CoV...
Assemblies of putative SARS-CoV2-spike-encoding mRNA sequences for vaccines BNT-162b2 and mRNA-1273
> https://github.com/NAalytics/Assemblies-of-putative-SARS-CoV...
Reverse Engineering the source code of the BioNTech/Pfizer SARS-CoV-2 Vaccine
> https://berthub.eu/articles/posts/reverse-engineering-source...
The different doses were guesses made to balance effectiveness with severity of side effects. (Earlier Moderna trials, at least, had included even higher doses, which could cause pretty severe side effects.) Their choices had to be locked in early, based on very limited preliminary trial data, in order to run their phase 3 trials as quickly as possible, to actually bring the vaccines to market quickly in 2020. They just made somewhat different bets. I think it's as simple as that.
https://github.com/NAalytics/Assemblies-of-putative-SARS-CoV...
I’m not gonna go into how the virus was sequenced or what the process to generate the vaccine was, but in this case, I believe your claim of being 100% identical is wrong.
https://github.com/NAalytics/Assemblies-of-putative-SARS-CoV...
I had the idea to print a couple posters for the occasion, so I made this tool. I linked a redbubble where I uploaded a couple of my favorite designs, but of course you're free to build your own with the tool and print them however you'd like.
1. https://github.com/NAalytics/Assemblies-of-putative-SARS-CoV...
[1] https://www.nature.com/articles/sdata201618
[2] https://github.com/NAalytics/Assemblies-of-putative-SARS-CoV...