Under normal circumstances, the performance of most index funds tracking the same index will be roughly at the same level, but not exactly the same. After all, there are many factors such as stock selection, position holding, market environment and trading level.

The income gap 1-3% should be normal after one year. Individual excellent index funds can lead the index funds with the same investment target by 3-5% or more a year, and similarly there will be backward index funds.