Peter,
You can overlap bands - just set the lower band for MINUS the band's height. Thus, if two bands are 15mm high, set the Gap (Profile View Properties, Band tab) of the lower Band to -15mm and the two bands will overlap perfectly.
Thus, you can insert the same band into the PV twice, set the Gap like that, and set them to the two different source networks and get the data you're after. (Acutally, you may need to create a copied Band Style that has the title switched off. Just a thought.)
HTH,
Trevor