That's about what I expected. So, there is a difference. Over 3".
You might be able to get away with that on a truck, if you've got the room to move the shock mount. On a sports car or dirtbike, package space is critical and you just can't do that.
It would seem to me that for non-res shocks, you'd need to use 2" more lift and 2" more bumpstop, OR move the shock mount up another 2" compared to the reservoir shocks to have them in the same operating range. That's the tradeoff.
Out of curiousity, what is the travel of the stock shocks on the Disco2?