I can’t get a photo close enough to show it, but the grid on the older version has thicker squares with more open space between them. The new one has slightly less dense squares and a little more fabric between them.
Both seem the same in terms of CFM/breathability.
It could be I am only seeing something that is cause by manufacturing variation, but I did read that they updated the fabric a little, so that makes sense.
The updated one also has a bit more stretch in the lower-stretch direction. So it overall stretches better in all directions.
The new one will also be more UV resistant over an even area. Since there is less variance between the grid squares and gaps between them, you don’t end up with bright spots and dark spots of light on the skin when in direct contact. For someone just laying out in the sun, not moving, the 2022 fabric should in theory be less likely to allow any small areas of skin to burn from UV more than others, if that makes sense.