Unusual Color on 1966 Barracuda

I have two 1965 Dart Chargers and both of them have 999 paint code. Most of you know that the 999 paint code on a Dart Chargers meant light yellow. But as someone said earlier in this thread, the code meant special paint, not special color. Later Dart Chargers had the 991 paint code and then from March 1st, 1965 the light yellow paint was officialy introduced and the code was changed to 881 from this date..