The M-Disc website has a list of compatible devices: http://www.mdisc.com/m-ready/ ... So BD media is a yes, DVD media is a no with recent Pioneer drives. The EBK is not exclusively listed, but if the DBK supports it, and the XJ supports it, the series in general should support it.
DBK versus EBK: The only real difference is the DBK doesn't support writing to BDXL (3 layer and 4 layer BD media), EBK does support BDXL media. (Note: only 3-layer BDXL media is really available, but is rare). Both drives support all the same other types of media and share the same features otherwise.
[btw, as your other post was very similar to this one, I've deleted that one. It's considered crossposting and is fairly confusing to see the same post in multiple places. ]