add any 250 to make 800?

[flohmann]

So my D250 started life as a D-Premier and was upgraded relatively early. I'm thinking about perhaps upgrading to a D800, ideally by purchasing another D250 second-hand. Is there any reason to prefer a set of 250s that were acquired originally as an 800, or can I pick up any used 250 and get good results in 800 configuration?

Thanks in advance, you power-mad 800 owners! :-)

Fred