Yes, they wil fit. The springs are interchangeable and the differences in ride height between all the varients is actually very minimal, 10mm tops.
The 182 cup front springs are a slightly progressive winding, having 5 1/2 coils, with narrower spacing near the bottom, which close up under load. Wheras both the non-cup 172 and 182 springs are linearly and only have 4 1/2 evenly spaced coils in the winding. (I've found its a very quick way of telling if its a cup spring just from a photo or glance under the wheel-arch!) The wire guage between them is the same and the free length is the same. I'd just point out here that its usually the case that if all else being equal, the fewer turns (coils) in the winding the higher the spring rate, which would imply that the cup spring is softer, but you can't really compare spring rates between progressive and linear rates as simply as that.
I've tried some non-cup springs on cup shocks and the difference going from the cup's progresive winding to the linear is surely going to make some difference, but its not that noticeable and didn't seem to upset the cars balance during my limited time on them.
As a side-note, I actually can't see any difference in later ph2 172 and 182 non-cup springs, their physical dimensions/construction appear identical to me.