I have 3 guitars , 1st one 440hz, than the others ones 444hz and 432hz. And i cant find the same notes on either of them around the fretboard. So it will be impossible to jam with someone. How i said before every frequency has its own alternative tuning. It sounds weird. Someone in E standard 440hz can jam with someone in Eb flat 440hz. Theres better explanation online. You guys that have multiple guitars try the test and see if you find any notes that match.