وهو إيقاع تباين بين أمرين من نوع واحد في المدح أو غيره
Tafrīq is the establishment of a contrast between two things belonging to one kind, whether in praise or another rhetorical context.
The clause “of one kind” matters. The things have a relevant common label or category, but the speaker then draws attention to a difference in degree, quality, or effect.
For instance, both people may be called generous, yet one person's giving is portrayed as slight and the other's as immense. Distinguishing two cases despite their shared category gives the figure its force.