It probably doesn't - Chris has an X2N in one of his RGs, and I know for a whole Adam used to SWEAR by this pickup, to the extent that it was kind of a running joke.
But what time I've spent playing Chris's 550 leads me to believe they're very different pickups.
It's fucking HOT, for one. The DAvtivators are pretty hot, but the X2N is hands down the hottest pickup Dimarzio makes. The DActivators are also voiced a lot differently - I actually really didn't like them, they were super bright, and did nail a lot of that "compressed singlecoil" sort of sound the 707s produces. The X2N wasn't as tonally distinctive, based on my recollections of the time I spent playing it - it sounded like a passive, but one with just a lot of, well, everything; it wasn't geared towards any one narrow frequency like the DActivators, it was more of a super-hot pickup that covered a broader frequency range.
If you want to absolutely slam the front end of your amp, this one is a good pick, but you should probably wait for someone whose experience goes deeper than playing shred licks through an unfamiliar rig while half in the bag every couple months.