Yep, careful you're not measuring stem quill diameter to reach your conclusion. It's steerer diameter that's the spec for forks/headsets/stems.

And the 90 or 110 do not refer to length of quill but rather the length of stem from center of quill bolt to center of bar clamp. This dimension reduces a bit as you raise adjustable stems, I imagine they take the measurement with the stem @ 90 degrees.