SPID Paint Option # vs. Color Names?

[samkost]

I was kicking back doing some web research on my 1972 C10's SPID and just learning more about our trucks.
My 1/2 ton long box was built at the Fremont Plant.
My SPID paint code states: 544 White/Medium Red.
So, a few questions:

Is Option #544 referring to my two tone paint scheme?
The SPID does not show a specific option code for the White color.

Cross referencing online I could not find the 544 paint code for my 72'.
Instead I'm finding Red Orange with a code #524 and #521 for the White.

I know many say the color is Hugger Orange, so is the Red Orange 524 just a code number for the after market paint suppliers like PPG?

Some photos below for anyone who can enlighten my curiosity and anyone else interested.

Thank you all for a great forum site,
Sam