Is the approximation of the Medial Frontal Gyrus in the region of the Dorsolateral Prefrontal Cortex? I'm wondering if the MFG is located in the region considered the DLPFC?
No; the medial frontal gyrus is medial; it faces the sagittal midline of the brain. Medial is the opposite of lateral; the dorsolateral prefrontal cortex is lateral, facing towards the outside of the brain.

Perhaps you are thinking of the middle frontal gyrus?