First, volume is not relevant. Radius is. What you’re looking for is the angle subtended by the radius of Earth from moon and moon from Earth.
Earth radius is about 6400 kilometers. X 2 is a diameter of 12,800 kilometers. Distance to moon varies by 43600 Km. Nearest point is 363,000 kilometers.
12800 km / 363000 km = .035 arctan of that is 2 degree subtend
Longest distance is 407000 km so 12800/407000 artan = 1.8 degrees
That would be how the earth looks from the moon.
The moon from earth is
diameter 3400 kilometers/407,000 kilometers and arctan 0.50 degrees
diameter 3400 kilometers/363000 km and arctan is .54 degrees
So the diff is 1.5 degrees, in pure math and this is an amount easily smudged outward by atmospherics for the Earth observer.
We are not worthy.....