The difference between the MTC and the BASCO here lies not in principle, but in severity. In the BASCO, you only have ten seconds to excel -- and do so within the limits / conditions of the mapmaker before you -- whereas in the MTC, the variation of how you can create a track is far wider. Any inspiration / borrowing that takes place, be it only a certain transition, takes up a far greater percentage of a BASCO stage than of an MTC track, without necessarily being as obvious as having the same percentage of borrowed material in an MTC track.