Matt,
the color head replaces your condenser head. It emits diffuse light, which reduces print contrast up to 1-1/2 grade (depending on the effective aperture of your condenser light diffuse light has always 1.0). Diffuse light will also reduce grain accent. So you may see fewer differences between various development techniques.
A color head is convenient for VC-printing, but some older color heads are not capable of reproducing a grade 5.
Different manufacturers have used differnt density nominations. One Afga density equals 1/2 Durst (densitometric) density. The dial can usually be pulled to add an additional 100 Agfa denstiy filter. So your head is capable to produce 100 dD (or 140 cc) magenta, which should be sufficient for a grade ~4,5