big difference between vs difference in

Hi
Can you please correct this if you may

1. The winningest poker players online shows you the most successful players at the online felt.

Are there different ways to say this paragrah?

2. There is a big difference between the winnings of the biggest winner and the second biggest winner, but as you go down the list the difference winnings tightens up. 1st place has 10 million 2nd place has 5 million, 3rd place 3 million, 4th 2.8 million, 5th 2.7 million, 6th 2.65 million, 7th 2.45 million.

3. There is a big difference in winnings between the biggest winner and the second biggest winner, but as you go down the list the difference winnings the gap shrinks tighten. 1st place has 10 million 2nd place has 5 million, 3rd place 3 million, 4th 2.8 million, 5th 2.7 million, 6th 2.65 million, 7th 2.45 million.

4 There any significant difference in quality between these two items.

5There any significant difference between the quality these two items.

What's the difference between
big difference between the X of something and something.
big difference in X between something and something.

Thank you fo your time.