Others have pointed out critical problems in your comparison. Clearly, you can't cherrypick the best universities in CA and compare them to second-best in TX. UTSA is not even an R1 university. Generally when people talk about top universities in TX, they refer to UT Austin and Texas A&M. In any case, neither UC Berkeley nor UCLA is a good representative of CA universities.
A major issue in looking at the averages at the entire university level like this is that you might be comparing apples to oranges. There are typically three ranks among research professors: assistant, association, and full. These positions can additionally have chairs. The salaries differ considerably across these ranks. Then there are teaching positions which are usually non tenure track. They may also have the same assistant, associate, and full professor positions but their salaries are much lower than the research professors. AAUP appendix has combined all of them into one single category.
Finally, this survey masks the salary differences among different disciplines. In American universities, B-school professors typically earn way more than other disciplines such as pure sciences, psychology, and engineering.
When we do salary comparisons (we have to do it while negotiating a raise), we pick out colleges/schools that are similarly ranked as ours and then we take average salaries of professors at the same position. As I mentioned, the salaries are public so this is possible although quite tedious.