[Elecraft] two k3's on the same band

[Matt Murphy]

Just wondering if anyone has any experience using two K3's on the same band
(for example, one for running, one for mults in a multi-op single
transmitter scenario).  Is there any danger of damaging the receiver(s) by
transmitting with high power so close by (different antenna, same
property).  Is there a difference if the transmission is a few KHz away vs
(accidentally) on the same frequency?

Just curious what sorts of precautions (if any) ought to be taken and what
solutions exist (if necessary).

73,
Matt NQ6N