What's the difference between berretta and biretta?

Berretta

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Definition:

• (n.) A square cap worn by ecclesiastics of the Roman Catholic Church. A cardinal's berretta is scarlet; that worn by other clerics is black, except that a bishop's is lined with green.

Example Sentences:

Biretta

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Definition:

• (n.) Same as Berretta.

Example Sentences:

• (1) As a curate, he startled the Cambridge parishioners of St Andrew's, Chesterton, by bicycling in a cassock and a biretta, though eventually the bicycle chain chewed up the cassock.