Is B3 blue the same as UU1 Blue?

I use ppg paint. The problem I have found is ppg can not mix most the old colors in DBC, in witch is there better paint. So they have to mix it there cheaper paint ( base). I have learned that the cheaper base it thin & does not cover well. So if your gona use it do not thin it as they say to do. The cheaper base is called shop line.