G-Sync works in the DRR, below DRR it still syncs by regulating the refresh rate in multiples of the fps (2,3,4,5), above DRR enables V-Sync.
FreeSync works in the DRR, below or over DRR you choose either to have V-Sync on so you don't get tearing but have some impact in input lag, or you choose to have V-Sync off so you might get tearing with V-Sync off if the frame rate goes above or lower than DRR but you get no input lag!
NO
G-Sync works in the DRR, below DRR it still syncs by regulating the refresh rate in multiples of the fps (2,3,4,5), above DRR enables V-Sync.
FreeSync works in the DRR, below or over DRR you choose either to have V-Sync on so you don't get tearing but have some impact in input lag, or you choose to have V-Sync off so you might get tearing with V-Sync off if the frame rate goes above or lower than DRR but you get no input lag!
So FreeSy...