Is B3 blue the same as UU1 Blue?

The problem as explained to me is PPG went out of business, and the type of paint made today isn't the same. None would guarantee an exact match, be it Single stage urethane, base coat,or enamel. Water based is a good option, but more money. If there is a good example of the original shade, and large enough area, the shop can use a scanner of some type to read it, and get a good match. That is hard, as most of the paint on a 45 year old car is pretty faded. My Painter had the best luck with base/clear with Gold, so that is the way we are going.