Yep, same as reference line.
Main differences:
The pprice
NA11 is also a network player, has AirPlay and internet radio
SA8004 is 96/24, not async and has only one output
Two outputs might be useful for people who want two use two headphone amps (like tube ans SS) or a headphone amp + speaker amp.
Reference series have higher quality components overall than the normal range.
Go listen to a PM8004, PM KI Pearl LIte, PM15, PM KI Pearl and PM11 and you will hear the increase in SQ step by step each time. I did exactly that with various pairs of B&W speakers on different occasions. I could blindfolded tell you if it's an 8004/Pearl-Lite, 15, Pearl or 11 if it's on the same speakers and thwy are speakers I know. The difference between the 8004 and Pearl-Lite I would have trouble with though.
I have been auditioning Marantz and B&W for years since the dealer is a friend of mine, so that could have something to do with it as well.
But still, the 8004 is one hell of a player for it's price, as was the 8400 I had before, the first SACD player they made if I'm right but it was too high priced at the time.