The mouse distance for a turn depends on DPI times sensitivity (eDPI). If that product stays equal, everything feels the same. New sens = sens × old DPI ÷ new DPI.
Example: 1.2 at 800 DPI becomes 0.6 at 1600 DPI.
Tip: change the DPI in your mouse software, then enter the new sensitivity in the game. In Windows, keep pointer speed at 6 and turn off "Enhance pointer precision".