I've never played Iron Kingdoms, but here's a bit about Dresden:
1) combat is quick. Unlike D&D people go down more or less like they do in real life. Healing for serious things takes a long time. Just because you take someone out doesn't mean they are dead - it means that you get to decide what happens to them (yes, "they die" is an option).
2) A wizard's magic can do a ridiculous among of damage (easily weapon grade 4 - 6) and, if a rote is used, doesn't really cost the wizard a thing.
3) The "laws of magic" are intricate to the game, but they probably wouldn't fit the Iron Kingdoms setting. First Law: no killing with magic.
4) In theory, given enough time and resources, a wizard can cast a spell to practically anything.
Looking at those points, do you think that the converse would be easy?
Richard