Yes. Having a cold is one of the natural variables in your voice and voice biometrics engines are designed to deal with variability. Furthermore, because VB engines exploit information that relates to the shape of the full vocal tract (i.e. the physical make-up of an individual) the effect of a cold will be minimal and catered for by the normalization of the system. A human might think that a person sounds very different from usual, whereas a VB engine will notice that fundamental features in the voice are always the same.