Yeah they are the same dude, i bought one a few years ago for £40 from magnum car panels. If you lived up here in the micra capitol of the world you could have gone to see my welder, he'd hand craft a pair of new ones lol.
I replaced the drivers side cill on my gs, but coz he did such a wicked job on the other side i've never bothered buying new cills for any of my other k10s. So i think you'll be looking at 40 - 50 quid per cill these days, just make sure they give you the right one, i.e. 2 door not 4 door, or vice versa.