Increase PWM bit resolution on only one timer 2 output I am new here and I know that this basic question has been answered in the past but what I want to know is this. And I cant figure out how to add this to one of those threads. Sorry in advance if I am posting this wrong.

Arduino Uno

I have a motor driven PWM off output 10 and output 9 is used for the display, can I change the resolution of output 10 only to 16 bit? or will both outputs need to be used as PWM when changing timer 2 to 16 bit? All of the coding samples I see are for changing both outputs.
As long as you don't use PWM (i.e. analogWrite) on pin 9, any changes made to timer1 won't affect pin 9.

It will change both outputs, as both use the same (single) timer.

But you can use code to convert a 8-bit PWM value to a 16-bit value by simply multiplying the 8-bit value by 256.