Perhaps dealer or manufacturer should ask permission of both parties FIRST before rearranging labels. I would start conversation with 'Would You Mind...?'. Never got problems with exact same issue a couple of times as seller. At no argument to me or to each other from clients, both receiving parties agreed to affix labels and send packages to each other and were happy thereafter.
There are some ultra-tight privacy doodz among clients that are paranoid even to uncover the address to the one in the different side of nation especially having the inevitable fact they've already revealed own adress soo many times to various online sellers they've lost count how manymany times it's been dondondone. You can also request to send to the FedEx or USPS office hold for pickup. Don't see issues... Sorry if I'm blind.
IMHO nuttin rong dere folks just another reason to panic or to get angry. That snowy winter delayed my packages to the clients by at least a week and yet some of them panic or asking for refund. OP should also apreciate the fact of swapping instead of shipping back and re-receiving, because it would've taken much longer than swapping between A and B.