Is B3 blue the same as UU1 Blue?

My codes are on the PPG guide. The DD1 in 67-68 is the same paint color, as the chart shows. The letters are the shade, and all the paint codes have the numeral 1 at the end. My 68 GTS is JJ1, for gold top,gold bottom. The Parts manual makes that clear. My 67 Chrysler is BZ2. Black painted top, gold bottom , two tone(2) 67 GTX SS1 yellow/yellow. 67 Plymouth is PP-1, red top,bottom. Then, in 1969 the first letter is the color, the number is the shade. This ppg sheet is available online, and is easy to read. I only addressed the 67-69 years, no others. On the 67 sheet, some letters carried over to a different color in 68, but not all of them.
On my 69 dart sedan it shows W1 W1, white top white bottom.