My understanding is that what was sold in North America as Epson Enhanced Matte (EEM) is now sold as Epson Ultra Premium Presentation Matte Paper.
Epson confuses people by changing the names of their papers from time to time. Many years ago it was sold under the misleading name of Epson Archival Matte (this claim was disputed by Dana but I stand by it), and it is still sold as such outside North America, e.g Australia. To make matters works, I'm fairly sure that rolls here are sold as EEM and sheets as EAM.
The term "Ultra" is key here, because what was 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. There used to be an official Epson page that showed all these correspondences, but they have removed it.