Does a different amount of salt (conjugate base to acid) used in buffer affect buffer capacity?

The most effective buffer against both acids and bases is one that has a 1:1 ratio of the acid:salt.  The amount of each component will determine how much acid or base can be buffered before the buffer is no longer effective.  I you are buffering against addition of an acid then you might want to have a 1:9 ethanoic acid:sodium ethanoate buffer.  If you are buffering against addition of a base you might want the opposite ratio of ethanoic acid:sodium ethanoate.  I think most buffers are near the 1:1 ratio of ethanoic acid:sodium ethanoate or other weak acid:weak base pair because it is able to buffer in either direction (against and acid or a base).

Different masses of salt merely translates into concentration.  Masses and moles are directly related through the molar masses of the substances.  Normally you will want to work in molarity of the buffer substances.  That makes later calculations easier.