No you just can't have Key 0 the same, you can put the same DN on another key on the other phone. say 2222 is on Key 0 on the Virtual Terminal and put that same DN on key 1 on the other phones.
This is a Signature and not part of the answer, it appears on every reply.
This is an Analogy so don't take it personally as some have.
Why change the engine if all you need is to change the spark plugs.