For 2D sensitivity, your cursor moves slower on the 27", at 0.8x the speed.
For 3D sensitivity, your sensitivity will feel faster on the 27", 1.125x the speed.
This is because you have the same field of view on the new screen, even though it is a larger size. You need to have a higher fov on the larger screen, maintaining the original 110 fov within the 24" portion of your new 27" screen. Using 110 on the new 27" is the same as using ~103.5 on the old 24". If you want to have identical sensitivity, you need to increase the field of view on the 27" to ~116.2. If you don't adjust the fov, you would have to reduce your sensitivity by 0.888x instead (cm/360 will increase by 1.125x), which will be identical to converting from 110 fov to 103.5 fov using monitor distance 0%.
tldr: You need to use 110 fov on the 24" and 116.2 fov on the 27".