Mudraj involves inserting or conflating speech or chain material that was not properly part of the cited transmission. Maqlūb changes the established order or relation of elements already present. Both are kinds of disagreement, but their mechanisms differ.
Case 1: Joining Abū Hurayrah's separate remark to a marfūʿ text: idraj.
Case 2: Rendering “Murrah ibn Kaʿb” as “Kaʿb ibn Murrah”: isnād reversal.
Case 3: Transposing right and left in the charity report: matn reversal.
One should not select a label merely by scanning an unusual phrase. The first task is to establish the preserved version and then determine whether outside material has been added or an original relation has been reversed.