No truth to that bullet weight. Shoot a bunch of different weights to make sure they work in your particular pistol, but I will bet you have no problems at all. Such a small and insignificant difference between those.
I had a Gen 4 G27 for a short time before it was stolen. Still to this date my favorite pistol of all time. Followed closely behind my first Glock, a Gen 3 G22.
:usaf: SrA Chuck