G8F to G3F conversion - incorrect eye texture

Iandryri

So I was following SickleYield's tutorial (https://sickleyield.deviantart.com/journal/Tutorial-Transferring-Character-Morphs-G1G2G3G8-409437916)

but in reverse order to convert G8F to G3F character. I managed to transfer the character morphs successfully. Next, I saved the material and shader presets from the G8F figure, and applied them onto the G3F figure (Applying base mat of the G8F directly to G3F figure resulted in an error). This works for everything except the eyes. The G3F version has a darker circle around the iris, which is incorrect. Also, I noticed the G3F eyeballs are slightly larger. Why does this happen and how to solve it?