As I said, the update aborts via VRM if you select the wrong file.
At least, that’s what happened in my test, where I deliberately selected the wrong file.
So, basically, nothing can go wrong.
Unfortunately, I couldn’t test a scenario like yours, as I only had US2000C/3000C units with the same board available.
So I can’t say for certain whether the master forwards the “wrong” file to the corresponding module or simply stops with an error.
I might ask our former Pylontech supplier whether they have the possibility to test this.