I confess it was I who told Jeff that Epson Enhanced Matte and Epson Archival Matte are the same. And I still believe that. There are several challenges in understanding Epson papers: (i) they keep changing the names; and (ii) the names that they're sold under in the US are sometimes different to the names that they sold under elsewhere, i.e. outside the US.
This post on Lula by an Epson marketing manager
states what I believe - that EEM and EAM are the same paper, but in the US the name was changed from EAM to EEM many years ago, no doubt for legal reasons as it's not an archival paper. It's had its name changed yet again to Ultra Premium Presentation Matte Paper, but it's still sold as EAM elsewhere. Certainly here, and also in Europe when I was living there, but that was some time go. I suspect that in metric countries it's sold as EAM and in countries in inches it is or was EEM, but now it's EUPPMP. Actually, it's even more confusing than that, because in Australia it's sold as as EAM for A4, A3, A3+ and as EEM for A2 and large rolls. See also:
According to this Epson link:
Matte Paper Heavyweight is now (non-ultra) Premium Presentation Paper Matte and, for the sake of completeness, Photo Quality Ink Jet Paper is now (non-ultra non-premium) Presentation Paper Matte.
To add to the confusion, as mentioned in that Lula thread, Epson Exhibition Fibre Paper is sold here as Epson Traditional Photo Paper. Not sure about Europe.
Getting back to Jeff's question, what is the difference between K7-2880-EpUltraPresMatte for the 3880 and the EEM profile that ships with QTR for the 2880 and 4880 printers? Given the above, you'd think that they were the same? [Edit: comparing them in curve view, they're clearly not the same]