The matching is important.  I think this process needs to allow the user to go back and make adjustments.  The reference pictures are imported, and the user can rotate, scale, and position them as needed, with reference points provided to try to line them up.  That works fairly well, but the nose is often still too high or too low.  A profile image can have the mouth and eyes line up decently with reference points, but the nose can be off, perhaps in part because the mouth is all muscles and thus an unreliable landmark.

But once the basic marker points are auto-placed from the front view, they are projected back on Z and (roughly) auto-positioned on the 3D head.  Once the Z-locations for those are finalized, those can be copied over to the picture side.  At that point, the profile view for the pictures has the Z-positions from the head and the Y-positions from its own

front view.  Which offers a better way to align the profile facial elements with the front.  The user needs the opportunity, at that point, to step back and realign the profile pic so it better fits the Y-locations it inherits from the front view.  Then the user can go on to set the Z-positions for the profile pic.

I think that probably sounds more complicated than it is.  A lot of this is more-or-less automated, just requiring tweaks and corrections.  The process I outline here should help better-align the two reference images, at least.  

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.