Actually from the SE forward that rule no longer applies. The cables were designed to block certain pins from passing on signals unique to the 400K drive in later 800K drives used in the SE, creating much of the cable confusion in the earlier drives. The earlier drives blocked the signals at the headers. The 1.4MB drives required the same special cables used with the later 800K drives as it requires a special signal, then again it was never intended to be used with a Plus or earlier. Either way, the SE onward does not generate any of the problematic signals, so the particular cable used is completely irrelevant and determines nothing on inspection.
In this particular case, if the SE has a downgraded 800K drive from a previous SWIM upgrade, then the cables could easily have changed as well. The main thing to look for to know what's in there is check the ROMs and the IWM sockets. Here are the upgraded part numbers to look for on the chips:
• SWIM (344–0062) at D8
• High ROM (342–0701) at D6
• Low ROM (342–0702) at D7