One is an Epson printer one is a QuadtoneRIP printer.
QuadtoneRIP has a rather annoying feature. When you install a printer it takes the curves from whatever folder the installer is in and places them in /Library/Printers/qtr/quadtone/(yourprinter)/...
To delete old and not-needed curves you have to delete that printer folder "/Library/Printers/qtr/quadtone/(yourprinter)/", then delete the printer in sys-prefs, then go to the folder with only the desired curves (that also has the Install.command) and hit the install.command again.
This will ensure all the new curves are there and the old curves are gone.
- GO to Applications/Piezography/Curves/3800-3880-K7 and install from there.
Alternatively, even more up-to-date curves can be found in the 3880-P2 curve folder.
You have the beta of our upcoming Piezography Community Edition release. So this location is not supported for everyone yet. SOON!