Both Uses of

conform
in
In Cold Blood

As usual, Willie-Jay understood; disheartened but not disenchanted, he had persisted in courting Perry's soul until the day of its possessor's parole and departure, on the eve of which he wrote Perry a farewell letter, whose last paragraph ran: "You are a man of extreme passion, a hungry man not quite sure where his appetite lies, a deeply frustrated man striving to project his individuality against a backdrop of rigid conformity.†
Chpt 1

conformity = compliance, fitting in, or being similar to what is normal

As usual, Mrs. Clare's notions conformed with those of very few.†
Chpt 2 *

conformed = complied, fit in, or was similar to what is normal

Definitions:

(1) (conform)
to comply, fit in, or be similar to what is normal
(2) (meaning too rare to warrant focus)
meaning too rare to warrant focus:

Although the forms conform and conformity (referring to complying with established customs or doctrines) are more often used, conformist is more likely to appear on standardized tests.