[N1 (Mirko)]

Originally Posted by Merlin66

A little more complex than that.....
https://www.telescope-optics.net/curvature.htm


I don't understand how eyepieces, considering the different curvatures of the telescope systems, can be compared across various telescopes.....

Nor does Alex (mental4astro). He's looked into this a bit, and has a thread or two on here with his thoughts on the matter.
Comparing eyepieces across different scopes is of limited use for many reasons, the shape of the focal plane is just one.