Both spells appear to have the same effect and they both have the same spell description. Except the first spell is lvl 16, 9 mana, and the second one that does the same thing is lvl 24, 50 mana. I'm testing with the Sorcery specialization on this character, so the spell levels are deflated compared to the unspecialized characters.
The MINDS_EYE spell effect (which both have) is ill-documented. However, with some digging it is revealed that Second Sight gives you a minimum light radius of 10 on the scried location, where Mind's Eye does not.
Both spells appear to have the same effect and they both have the same spell description. Except the first spell is lvl 16, 9 mana, and the second one that does the same thing is lvl 24, 50 mana. I'm testing with the Sorcery specialization on this character, so the spell levels are deflated compared to the unspecialized characters.