The only way you will be able to correlate the setting in one converter to another is to run tests on each and compare the images. The numbers aren't useless they just don;t do want you would like them to.
If you use PS as Aperture's external editor you are going to be seining PS a tiff or psd file not the Raw file so I'm not sure your concern is justified.
All I can do now is throw out the Fine Tuning default, set everything to "0" and go back to doing everything manually in Photoshop.
Well if you are doing the conversion in PS then the settlings in Aperture have no effect anyway. And if you are doing the conversion in Aperture you are sending a tiff or psd file to PS (a I wrote above) and then the PS converter doesn't come into play.
The only way your concerns would be something to worry about is if you are doing two separate conversions, one in Aperture and one in PS, and wanted the two separate images to be identical but I'm not sure why you would want to do this.
regards