Mars is about twice the diameter of the moon, ~4,000 miles vs ~2,000 miles. It appeared about 1/100th the size at the time of the occultation, meaning it was about 200 times farther away, 50 million miles vs a bit less than 1/4 million for the moon. Both objects were also at opposition that night, Dec 7/8, 2022, 180 degrees from the sun in the sky from Earth's point of view. The moon is full at opposition (the very definition of truly full), planets farther from the Sun are basically closest, biggest and brightest during opposition. The Sun, Earth, moon and Mars were all in a straight line in space that night, an event called syzygy.