Yes, but it's close to what you had before with 1080p.
This will get you close to what the cursor speed is without 125% zoom yes. But reducing by 25% is not the same as increasing by 25%, so it's slightly off. Reducing it by 20% would be a perfect match.
Some games are affected by WPS, so it depends. If they are affected, the WPS field in the calculator is unlocked.