They are?  I'm pretty sure I used a DEQNA cabinet
kit with a
 DELQA on a MVII for years. 
It would also help explain why I've got 2 DELQA's without cab kits, and an
extra DEQNA Cab Kit.
On a positive note, the VAXstation II/RC I stole the DEQNA from needs a
DELQA if I ever get it running and the PDP-11/23+ can make do with a DEQNA.
                        Zane