Ṭuruq are routes of expression, while tarākīb are the linguistic constructions by which a meaning is communicated. Merely exchanging words does not necessarily create a meaningful distinction in bayān. What matters is the route by which the listener reaches the intended meaning.
Direct: “This man is brave” explicitly predicates bravery.
Figurative: “He is a lion on the battlefield” evokes bravery through the image of a lion.
Allusive: “His feet do not falter in hardship” suggests courage through steadfastness.
The last two employ different connections to the desired quality and are not merely interchangeable dictionary synonyms of the first.