Here is a supplemental answer.
Dont show priority with different colors! Use Different shades of the same color
You can change the shade of a color to prioritize or show emphasis without introducing new colors.
By altering shade you can show similar emphasis than introducing different colors.
*note the other strategies such as position and numbering I agree with but I feel as though using the color wheel is not the best strategy and it is 100% useless for 4.5% of the population (8% of males and I think 1% of females).
In short I feel as though the design on the left isnt much worse than the design on the right
I am not colorblind so its hard to empathize with see the following images to have a better understanding