Given a permutation $L$ of the $n$ vertices of the directed acyclic graph $G=(V,E)$.

Question: is it NP-hard to find the topological order of the $G$ that is the most similar to the given permutation $L$?
 
(The most similar is that the least number of elements' positions are changed.)

Note: the topological order means the $n$ elements should be placed according to the constraints in $G$.