There is not one. You can assign a shortcut by going to
Edit > Keyboard Shortcuts > Menu Commands > Select menu > Same > Fill Color.
Here I used Cmd+Opt+F
I'll move this to the Illustrator forum from the Photoshop forum.
Thanks for reaching out. Jane is absolutely correct. In addition to her response, please find more information on keyboard shortcuts & how you can customize them on this help article.
Hope it helps.
Illustrator has a very old command to do something similar, but it works to redo whatever the last operation you did on the Select Menu, it is called Reselect and his shortcut is Command6, I use this all the time