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(I hope this post is confusing enough)
Yes, it is.
You have a bunch of 25-meter military 300-meter zero targets... and there's a 1.5 inch difference between those targets and... what?
I'll end this post with a better question: Does it even matter?
Holly thread revival Batman!!
Barrel lengths and ballistics not withstanding, y'all aren't factoring in the differences in sight radius from carbine, mid-length, and rifle length gas systems in this discussion. The geometry of the sight-line above the bore-line is affected and therefore will affect the elevation setting of your battle-sight zero.
All things being equal using an A4 upper with carry-handle and an F-marked FSB to maintain the same height above bore-line, the angle of intersection (or deflection) of the sight-line and bore-line will be steeper with the carbine gas length and decreases the longer the sight radius gets with the mid, and rifle lengths.