Technically, this is possible.
In reality, this may depend on whether you want to distribute your assembly internally or externally.
Using internal distribution with Apple TestFlight, this should not be a problem. You just need to create a new package identifier in the developer portal, a new distribution certificate, a new distribution distribution profile, create an application with all this and upload it to iTunes Connect and distribute it.
Using external distribution, it is also technically feasible, although Apple will manually view applications sent through an external beta distribution that may cause a problem. Apple may reject it.
Since nothing technically hinders this, I would ask him and report back.
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