The second game England vs Srilanka is an ODI which is a longer format. Every team gets to play 50 overs or 300 balls. So the team batting scores much more they do in T20s where they get to play only 120 balls each.

The scores for ODIs loom around 300 runs most of the times these days. You can still be correct with 165, I'm just making you aware about the different formats in Cricket. If you want you can edit your score Prediction.