In 9 mm Luger the short answer is NO.
Only trim 9mm if they reach 0.754' , then you can trim them back to 0.749' or 0.750' . It's not that critical.
For some reason the 0.743' cases reload and shoot just fine.

Let me pass on a hint I learned , don't bother measuring and trimming 9 mm or 45 acp , just sweep them up and reload them, all the measuring, sorting by length and head stamp really does no good for ammo shot informally at under 25 yards...unless you're shooting for money.
The targets I have shot at 25 yards do not show any better accuracy between trimmed and sorted cases and mixed cases untrimmed ....exact same bullet and powder charge....I would have never believed it , I would have bet money that sorted and trimmed cases were more accurate.....they are not.
Or at best they might be marginally more accurate....but not enough to go through all that trouble.
Anyone else conduct a test like this. Rifle ammo is another story.
Gary