Great question but I don't know the answer!
What is the difference between a Brilliant Move and a Good Find?
A brilliant move is when you play a move that takes the engine a while to see(I think.) A good find appears to be when you play the only good move in a position(such as the only winning move or the only drawing move, depending on the position.)
A good find could be just taking a free piece or a fork which has no brilliancy but it’s the only move that gives you adventage. Engine doesn’t see the beauty of tactics. It just see the variations, evaluations and how much it takes to calculate.

What is the difference between a Brilliant Move and a Good Find?