In tashbīh al-jamʿ, one subject is compared with multiple comparators; each may illuminate a facet of the intended quality. For instance, a person may be likened to a lion in courage and a mountain in steadfastness.
In tashbīh al-taswiyah, multiple subjects are brought under one comparator or standard in a particular respect.
The diagnostic question is whether the structure has one subject and several standards, or several subjects sharing one standard. The actual mapping of terms must be checked.