B strings will ALWAYS sound different than the other strings.
To a variable extent. My 34" scale CB Rami 6 has a zero fret. Both the open E and 5th fret B sound near identical. E first fret and B 6th fret of my Conklin and Rob Allens also sound near idential.
I use a fairly light touch and am a little OCD with my setups. Just a little.