Si,
The 2 head units i looked at were both bottom cd units, 1 out of a T reg the other a W, only the main plug looked different like you say has more pins. Had a nightmare with a breakers who sold me a knacked unit, they told me they tested. When i sent it back they said i'd swapped it for mine, had to drive 150 miles round trip just to sort it out ,anyway to cut a long story a bit shorter thats when they produced this T reg unit that had more pins, and tried to flog me that. Wanted to cut the loom to fit it. so with that i took my money and run before the side cutters came out