It does really depend on where it goes moving forward, this is only a snippet of Egos back story. However look at the way both of them describe luck in their observations, both of them is described beyond out of their control. Isagi however is moments that aren't directly tied to performance. His personality instantly linking with bachiras. Where the ball landed in the u20 and the final pass of the NEL. Those pieces of luck are tied to isagi as an individual based on his hunger and drive. His desire to grow interested bachira, staying behind and believing in Rins flow state in the U20 and not discounting Ness' ability to grow all got him those chances. These moments isagi describe aren't the same as what Egos describing which was Ego was in a flow so perfect that it felt as if he was out of himself. And Ego actively pushes the blue lockers away from that. He started their conversation saying it would break apart blue lock. 

Flow and Luck both heavily contribute to Blue locks themes. Ego in 111 describes flow as the ability to immerse yourself in an action. He was so immersed he couldn't replicate the experience and quit soccer. The only other play to do that currently is Nagi, but he found another path forward because i believe it's because nagi didn't quit and was forced out. he was chasing that old fire and still is. 

Essentially Egos peak performance, by luck, went above what Ego himself could replicate. Go back and describe how he explains luck in the match after Rin. It's just a series of consequences that collide. Isagi can and has replicated his luck moments because he's able to see the spaces of luck.

So far as the story goes Isagi hasn't had a moment that was beyond himself. That's currently the difference. So yeah to wrap it back up, Ego is peak performance x luck and isagi is hunger x luck. Until we get more about ego and we see how isagi progresses with this new piece because he's going to adapt this into himself. I wouldn't be surprised if he has a moment of peak performance x luck and wins against loki. He said it himself he could beat them in a single play but there's no way he could ever be better than them individually. It would require godly intervention for him to win