quantitative relation vs magnitude relation

quantitative relation and magnitude relation both are nouns.

Word	Noun	Adjective	Verb	Adverb
quantitative relation	Yes	No	No	No
magnitude relation	Yes	No	No	No

As nouns, quantitative relation and magnitude relation are synonyms defined as:

quantitative relation and magnitude relation: a relation between magnitudes

quantitative relation (noun)	magnitude relation (noun)
a relation between magnitudes	a relation between magnitudes