Sure wouldn’t we all, but you’ll be waiting on LE Audio bluetooth to be mainstream before this happens across the board.
So unfortunately it doesn’t quite work like that, it’s not as easy as just saying that, it would take a bit of time in programming them to get something similar, but you won’t get a Phonak sounding just like a Oticon, these are two very different brands working on different principles ( looking for the same result tho)