It's dissimilar in that you'd have to capture a particular controller; the factory grants mark IV of *all* your fleet ships.
It also means you only get the full benefit of a Core Turret Controller if you've unlocked Mark I-III of the same turret, in which case you may very well not need Mark IV of that turret.
It also means that to get Mark IV of a turret that you desperately need more of, you have to go find the associated Core Turret Controller, and if it was easily acquired, you probably would have captured or hacked it already.
Finally, it would mean you only get Mark IV turrets if you have Vengeance of the Machine turned on.
Neat idea, but doesn't seem ideal in practice.