I believe there is no probsems swapping them from different boxes but before you do apply some heat to the chip ie hairdryer or irf you have a hot air solder station all the better the plug in if box boot up ok when the chip is still hot your 99% sure the nvram is at fault.If this works get the box set up where you intended to put it, heat up the chip, power up the box,carefully put the lid on and it should work fine as long as you dont unplug it!!!!!!!!