Regarding the Nusach haGra, most people don’t follow it. It’s only people who usually follow minhagei haGra that daven his nusach. Most daven regular Ashkenaz, which is NOT the Gra’s nusach.
Also, there are siddurim that are Nusach haGra which list the source for each change he made. It clearly shows what his Mesorah was for the changes.
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