My usecase is as such - I've got 2 RasPi Zeros, one of which is acting as an input for a USB device. I'd then want to forward some data via GPIO to the second one, which acts as a USB device connected to something else. Would this be okay, or would I need to take care with grounding and such?
Furthermore, to make it easier I was going to try use a header connector as such:
Zero----- GPIOHead| Zero----|
Would that lead to any issues or would I just be better off soldering the leads I need?