F means me when she says "δοκιμάζω"
Λοιπόν, Photoshop says 121 / 121 / 121 (rgb) for square A and 120 / 120 / 120 for square B
Analytically each square contains a range rather than a continuous shade: A: 118 - 126 and B: 116 - 121 ...so tricky, but they are very, very close :-)