They are only the same at 70: https://www.mouse-sensitivity.com/?share=280ec8fb3d437253292beae4fd2b00c2
Apex uses a multiplier visible in the config file to the 70 value (so the max in-game of 110 equals 1.55 in the config file which equals 70*1.55=108.5). There's a small offset from the in-game value, probably down to lazy coding by the devs.