Ah. Well theoretically.....
If you want to stroke a B16 with a factory crank/rods, you typically won't be able to do so because the piston will extend past the deck of the short block and ram into the top of the combustion chamber. If the stroker kit claims to be able to stroke the B16 to 2.0L, then it uses some more trick geometry to be able to extend stroke without having clearance issues. The geometry is probably also better than just stroking the engine, so rev capability probably isn't compromised as much. My guess is that most of the stroker kits on the market use a long stroke crank (duh) with slightly extended rods and pistons with extremely high wrist pin mount points. This would allow for more stroke without smashing the pistons into the valves/combustion chamber, and still retain some sort of decent rod/stroke ratio. This might be all worth it if you want to build a really tame looking sleeper... you could have a high revving 2.0L engine hidden under then "B16A" stamp on the block, with a ton of internal modifications to the head to back it up.
How does that sound for you?