As a matter of fact, I don't know whether there is any difference between the source words in bold below:
From Latin ingeniosus (“endowed with good natural capacity, gifted with genius”), from ingenium (“innate or natural quality, natural capacity, genius”), from in (“in”) + gignere (“to produce”), Old Latin genere. Compare French ingénieux; see also engine.
From Latin ingenuus ("of noble character, frank")
And I wanna know the help of discerning the Modern meanings of those two words with the grammatical suffixes in Old Latin or Greek above.