The scan of the Ditzler chart makes the Medium Blue Poly look darker then it really is. It looks to me like the same color as the 64 on the other thread.
On page 2 of the chart it lists the interior color for the I/P face as Lucerne Blue Poly with the Ditzler code being 12656. That's the same Ditzler code as themedium Blue Polt exterior color.