Both Uses

conform
in
In Cold Blood
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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)
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.