That post has absolutely nothing to do with the OP's question.
To answer the question, G07's and K4900's use a 29mm (fat neck) tube, and most K7xxx 19" monitors used a 22.5mm (skinny neck) tube. Although SOME K7xxx chassis were outfitted with neckboards that had a 29mm neck socket on them, but they are not as common.
tl,dr; most 19" tubes are interchangeable, yes. As long as the neck socket matches.