Re-dyeing Roots?

I dyed my hair last night with a different color than I usually use. It was a permanent dye. The roots are lighter red than the rest of my hair, and now I want to dye them with a darker demi-permanent dye to make the roots match the rest of my hair. I don't want to wait another 4 weeks to dye it, and I'm not going to a shop. Would dyeing it with a demi-permanent color mess up my hair less than using another permanent dye?