Yeah but a lot of these are contemporaneous cranial ridges meant to show considerable genetic diversity among Klingons, which is a separate issue from them tweaking the makeup over the years.
The biggest (Klingon makeup) jump of the pre-Kelvin Paramount era, is from Motion Picture to Search for Spock. Kruge doesn't look too different from the early TNG Klingons, which were gradually refined; and then expanding the concept of greater cranial variation among Klingons (a concept which began on Search for Spock).
But the look of the Discovery Klingons is a much more drastic departure than any of the changes from 1979 to 2005, which becomes especially obvious when one sees them in profile: