Although there is no standard method for measuring output, so the two numbers may not be an "apples to apples" comparison, the difference appears to be quite small. Also, 70 db is quite a lot of gain for a phonostage. You should have plenty of gain for that cartridge. A friend uses it and really likes the Dynavector.
Am I going to need a step up transformer?
Just sold me beloved Benz Ruby 3 that was rated .34 mv output and now thinking about a Dynavector XX2 MkII rated at .28 mv. My phono amp has a gain of 70 db. I would say I had my volume control on my pre amp at about 2:00 for loud listening with the Benz. I really want this to work without a SUT.