On July 24, 2017, Gasol re-signed with the Spurs. On December 20, 2017, he had 20 points and a season-high 17 rebounds in a 93-91 win over the Portland Trail Blazers. On December 23, 2017, he recorded his 10th career triple-double with 14 points, 11 rebounds and a season-high 10 assists in a 108-99 win over the Sacramento Kings. On December 26, 2017, in a 109-97 win over the Brooklyn Nets, Gasol collected his 10,817th rebound, moving him past Jack Sikma for 30th in league history. On January 26, 2018, in a 97-78 loss to the Philadelphia 76ers, Gasol became the 34th player in NBA history to play 40,000 career minutes. On March 25, 2018, he had 22 points on 10-of-15 shooting and grabbed 13 rebounds in a 106-103 loss to the Milwaukee Bucks.

Answer this question based on the article: How many more points did Gasol score on December 20, 2017 compared to December 23, 2017?
6