Congruity vs. Congruence: What's the Difference?

Congruity and Congruence Definitions
Congruity
The quality or fact of being congruous.
Congruence
Agreement, harmony, conformity, or correspondence.
Congruity
The quality or fact of being congruent.
Congruence
An instance of this
"What an extraordinary congruence of genius and era" (Rita Rack).
Congruity
A point of agreement.
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Congruence
The state of being congruent.
Congruity
The quality of agreeing; the quality of being suitable and appropriate.
Congruence
A statement that two quantities are congruent.
Congruity
An instance or point of agreement or correspondence; a resemblance.
Congruence
The quality of agreeing or corresponding; being suitable and appropriate.
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Congruity
The state or quality of being congruous; the relation or agreement between things; fitness; harmony; correspondence; consistency.
With what congruity doth the church of Rome deny that her enemies do at all appertain to the church of Christ?
A whole sentence may fail of its congruity by wanting one particle.
Congruence
A relation between two numbers indicating they give the same remainder when divided by some given number.
Congruity
Coincidence, as that of lines or figures laid over one another.
Congruence
The quality of being isometric — roughly, the same measure and shape.
Congruity
That, in an imperfectly good persons, which renders it suitable for God to bestow on him gifts of grace.
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Congruence
Matrix similarity by an orthogonal matrix.
Congruity
The quality of agreeing; being suitable and appropriate
Congruence
(algebra) More generally: any equivalence relation defined on an algebraic structure which is preserved by operations defined by the structure.
Congruence
Suitableness of one thing to another; agreement; consistency.
Congruence
The quality of agreeing; being suitable and appropriate