Devotion vs Piety - What's the difference?

In uncountable terms the difference between devotion and piety

is that devotion is religious veneration, zeal, or piety while piety is similar reverence to one's parents and family.

("devotion on Wikiquote")

(en-noun)

(uncountable) The act or state of devoting or being devoted.

(uncountable) Feeling of strong or fervent affection; dedication

(uncountable) Religious veneration, zeal, or piety.

(countable, ecclesiastical) A prayer (often found in the plural)

(uncountable) reverence and devotion to God

Colleen's piety led her to make sacrifices that most people would not have made.

(uncountable) similar reverence to one's parents and family

(countable) a devout act or thought

* filial piety