Difference of hair color in back of head in comparison to front. Any suggestions?

Hi, I am considering getting an FUE transplant. My hair is a sort of dirty blonde color. In the front where most of the hair will be transplanted I am more blonde than where the hair will be taken out from (back of head). My question is whether the hair color in the front will receive the more blond-ish color due to sun exposure and position or will it stay rather dark like its origin. Thanks in advance!