Yes, if by share you mean post, no copy/paste needed, complete app switch.

It is like having multiple Primal apps. Relays change, you can post as another account, as it you are using your primary one.  

 Nice! Do they merge multiple feeds as one as well? 

 That they don't do.

tbh, that would be confusing. I personally won't want that. 

 I am getting more convinced that this idea of switching things around doesnt make any sense.  

 You would prefer to have one feed for all accounts, and make the user select which account they are posting from at the post/like/reshare/zap level?