Most BB are of a fixed length and the offset or symmetry are a manufacturing design,
and so only by buying a different BB will it be any alteration. 1/4" may be having used a symmetric BB
and then installing a Crank set better suited to a BB that is not Symmetrical, [or visa versa]

though The right crank arm is better judged by how well the chainline is laid out,
in relation to the cassette, F/W gears on the back

and letting the pedal relationship be Que' Sera, Sera.