4K Box Question

I just bought a 4K TV.  I have a 4K box on one of my TVs (the cable into the room didn't work - so, the technician used a 4K wireless box).  If I take that box and plug it into another HDMI port on my new TV - will I be able to use it while my old Box is still plug'd in... In otherwise, If I select the HDMI port with the wifi box - I should be able to see how 4K looks via the wifi.  If I select the other HDMI with the old box - I will be able to watch TV normally.  If the WiFi works - I will just move the old box to another TV in my house.

Thanks!