Both Uses

contrast
in
Where the Crawdads Sing
(Edited)

Tate noticed that while her face and body showed early inklings and foothills of womanhood, her mannerisms and turns of phrase were somewhat childlike, in contrast to the village girls whose mannerisms—overdoing their makeup, cussing, and smoking—outranked their foothills.
p. 99.6 *

in contrast = in a comparison that shows differences
In contrast, the courtroom itself, designed to replicate the original, was imposing.
p. 258.7

Definitions:

(1) (contrast as in: contrast their writing styles)
point to differences between; or compare to show differences
(2) (contrast as in: there is a contrast)
a difference -- especially a notable difference; or the side-x-side arrangement of things that draws attention to an unmissable difference
(3) (contrast as in: sharpen the picture contrast)
the difference between tones of an image -- as in a photo or video -- such as the quality of brightness or the intensity of shades or colors
(4) (meaning too rare to warrant focus)