The pale, pastel yellow (almost white) lovebirds are called creaminos.  Yes, they are a member of the "peach-face" species.  "Peach-face" refers to a species, not really a color.  The original peach-face lovebirds found in the wild DO have peach faces, but with the introduction of the many various color mutations, not all peach-face lovebirds necessarily have peach faces anymore.

The ALBS website has a picture library of many of the different species and color mutations of lovebirds.  You may find this an interesting place to look at the photos of the different colors.  The colors are identified under each photo, so you should be able to locate the color that you are thinking of and know what name the mutation has specifically.