Yes Allan the 3 batches were different in colour. The 73 I had was painted Canary Yellow.....Good Ford colour... The 72 was painted yellow over the original red such I think was the hurry to get it out there on the grid.
I bought that car as a project and had been burnt but not badly damaged.. I forget the number plate and whos it was but from memory was one of the South Islanders that ran it.
The 73 after I sold was raced in classic racing down here extensively by Ross Church.
Great cars and my lovely tells me I should go and buy another....