sorry for delay
in Vala Palette mode, the color of the pagination inherits from the Main theme color-Darker option. if you want to change it for dark/light modes, enable the Customize Main Theme Color option in (RD) Main Theme Settings and change the Main theme color-Darker option for dark/light.
you can also use the (RD) Front-End LIGHT/DARK to manage all colors for dark and light modes, just like the default IPS mode.
hope this helps