different between consonance vs congruity

English

From Old French, from Latin consonantia

consonance (countable and uncountable, plural consonances)

(prosody) The repetition of consonant sounds, but not vowels as in assonance.
(chiefly music) Harmony; agreement; lack of discordance.
- 1865, John Tyndall, On Radiation: The "Rede" Lecture, Delivered in the Senate-house Before the University of Cambridge on Tuesday, May 16, 1865, page 33
  Like a musical string, the optic nerve responds to the waves with which it is in consonance, while it refuses to be excited by others of almost infinitely greater energy, whose period of recurrence are not in unison with its own.

From Old French congruité

congruity (countable and uncountable, plural congruities)

John A. Simpson and Edward S. C. Weiner, editors (1989) , “congruity”, in The Oxford English Dictionary, 2nd edition, Oxford: Clarendon Press, ?ISBN

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