Moving APK from one Android box to another

I did a search and couldn’t find an answer. I have avery functional APK on one of my boxes. I downloaded the so called same version to another box but they don’t function the same because one is older and it’s not being supported anymore. Just copying it to a USB and reloading it to the other? Thanks

Sure, if it is a box with USB ports. I prefer Cloud storage, stick it in there and then access from the ither box and load.