TLOU2 have both a heavy grain filter (that you can disable now but not at launch) and an overall very cold color tone. So you have this constant blue or green filter, and sometimes with rain.Also, having just replayed TLOU2, I weirdly can't help but think that the graphics are somehow better in a lot of ways in U4 compared to TLOU2.
There is one exception, the "giraffe moment" of part 2 is the first day at the farm, with very warm colors. The last day at the farm, with Tommy, it's still warm overall but way more neutral.