Here you go, there is the graph:
So overall, shock nade is the same as a standard (Tommy) nade up to 2 meters, then becomes better. Bundle nade is pretty much just a straight upgrade from a normal grenade in terms of AoE profile.
I don't know about the exact fuse times (see OPs post for that), prices are 30 (Shock nade and normal) or 35 (bundle), respectively. I don't know what Vipper is talking about by saying it were cheaper than other grenades, because that is wrong.
In total though: There is no reason why the Shock nade should be better than a normal one apart from specific unit design. I have not made up my mind if this is necessary or not, but overall it's fair to say that the normal grenades usually come on units that have decent mid to long range DPS and therefore have a chance for a squad wipe after the grenade hit. The Shock nade has 20 range, however if you want to combine a grenade with small arms fire for a wipe you need to be within range 10-15 at least, otherwise the Axis squad will be long gone before you can do some damage.
So I can see a decent reason why the Shock grenade could be a bit stronger than a normal one despite the same price. If the current extend is fine is debatable. But if it needs to be changed I would say that the change should be minor.
I disagree with OP though that the Shock nade can be described as "roughly equally lethal" as the bundle nade. The Shock grenade is clearly closer to the normal standard nade than the bundle nade/light gammon bomb)