The tone will blend in over time. You did not say how long you have been shaved, but I would expect that in a few months you will not be able to see a difference in the tone of the scalp from your face. The timing depends on how much exposure you get, but be careful. The newly shaved skin will sunburn very easily.
Some have used sunless tanning lotion to help even out the tone, but I do not have experience with that.