Actually, do copy the remote post's GUID from provided JSON.
Actually, do copy the remote post's GUID from provided JSON.

Reasoning: a post's URL can change (due to permalink-slug-style titles changing, for example), while the GUID must never change, so the two may, in fact, be different from each other.
hmans/pants,spacetraveler/pants,hmans/pants,KlausTrainer/pants,spacetraveler/pants,hmans/pants,spacetraveler/pants,halfbyte/pants,KlausTrainer/pants,KlausTrainer/pants,halfbyte/pants