Most modern condenser enlargers use a coated bulb so are already somewhat diffuse so the differences in local contrast between them and a fiffuser enlarger with a dichroic head is minimal. They do show up any dust though.

However if you use a more intense small light source, usulally refered to as a point source enlarger with condensers you can increase the local contrast but setting the lamp needs to be done every time you change the enlargement to get the best illumination, the lamp housing needs to be quite tall (on a vertical enlarger).

A dichroic head enlarger is far better all round whether it's a dedicated VC head or Colour head.

Ian