The critical piece you are missing that the NUC10i7FN is a 15w TDP CPU (Intel i7 10701U) that normally runs at 1.1ghz, and the NUC8i7BE is a 28w TDP CPU (Intel i7 8559U) that normally runs at 2.7ghz.
Look here as a comparison between the two:
“Single Thread Rating” is lower on the NUC10’s CPU.