Are you kidding, you can't compare the two versions as being the same because he physically didn't look the same in the two films.
The first HT captures Fox's likeness in the 1985 film and this version captures fox in part 2 where it was four years later in 1989 in which Fox was older and gained some weight. Not only that Fox's hair was longer in Part 2.
Now if a Part 3 western Marty comes out it probably will look no different than this since Part 3 was originally filmed during Part 2.
So think of this version of Marty as a little older version of Marty four years later from the first Marty. In which IMO, HT nailed his likeness