See the differences in the xyz location and angles of incidence.
I do see the the differences  the angle of incidence didn't change just the x,y,z

0.307 – HUD radius (feet)
my bad  I forgot that

CSWeapon!hud3d, 526, 515, 550, 550
That makes the hud gauge elliptical  I was thinking the target circle, (the red circle).  I would assume the answer is most likely no, it stays a circle.

2D HUD or 3D VC HUD?
Most aircraft with a HUD, have a switch to turn on/off the 3D VC HUD. But for the 2D HUD you would need to create an XML switch for it that you may or may not be able to put on a 3D panel in front of you.
I was thinking of keeping the stock hud and the csweapons 3d hud.  
If i remove the stock hud, the left behind switch doesn't turn off or on the csweapons hud. (the original hud has some nice features, cage uncage, declutter, color changes etc. plus graphically it is cleaner ) Even if it did If i put both huds in the vc the one switch would turn off and on both I would assume .