I think so.

I just picked up a guitar and tried it to see how I form (123) open G automatically subconsciously to give you a baseline comparative. Played a few riffs to check out my changes from various other chords to G.

Consistently, 123 fingered G is one chord I land all three fingers in unison on the strings simultaneously. I should add in fairness that I've always found G an easy chord, appreciating not all do.

Keep plugging away. Muscle memory will get you there.

I'm constantly working with awareness to refine finger distribution and positional placement on the frets for optimum tone of each open chord. G fortunately isn't one of them, but ACDF all come to mind. Although I play them subliminally, I make a point of remaining cognizant to discern nuance in fingering.