Eye lens is on the left and field lens on the right. The spacer between them is to the right of the lenses. The curvature radius of the two inward facing lenses appears the same with an approximate radius of 9.2mm.
The first surface of the eye lens on the far left is very slightly convex. The thickness of the 2nd element of the eye-doublet is approx. 1.6mm. The thickness of the 4th element or field lens is approx. 2.2mm. When the lenses are assembled the approximate distance between the centers of the two convex inward facing lenses is approximately 0.3mm.
Bottom line is that it looks to be three different lens types making the two doublets not symmetrical. The two inward facing convex lenses however appear to be identical (they only look slightly different in the pic because one is slightly leaning).