I think I found some specs on the KS pistons (this example is the "standard" option):
https://www.kmotorshop.com/en/articl...103101e-076069
If I am reading this correctly, the height is the same as the green book spec (71.7mm) but the weight of 690g is much heavier than the green book spec of 455-465g.
Is that an acceptable difference? Would it have any noticeable impact on engine performance?