Original engine colors??????

I can tell you this... I have been in the car business since the mid 80s and have seen things like Dodges come in with plymouth grills because the factory was short on the Dodge grill... and so forth... I hardly believe that in 1969 the factories were so strictly regulated that they wouldnt use what ever paint they had on hand due to supply or timing.
If the 69 Engines needed to get done and all they had was some left over 68 red ...they painted it red.... Or maybe the decision to go Turquoise hadnt been made till a few weeks into production Mopar was not going to repaint the already produced engines.
We just got the new 2019 Acura RDX with Apple Carplay and Android Auto. Guess what ? No Android Auto ! had a compatability problem.... No one told us ! I spent 45 mins trying to get an Android to work ! It will be out soon...
Things are still fluid in the factory.
Cars get delivered with stop sales because of a component issue. Then they ship to updated component and we install it here. The production line must keep moving.