I use the scibor miniature as a rune priest. I think for heroes the scale works well with GW stuff, but the scibor stuff is way too big to replace units imo. I'd say they are at least a full head taller.
Here is a gallery of a warband I painted for another game, it has a mix of dwarves from different companies (mainly reaper) but hopefully it helps you get an idea of the scale.
https://imgur.com/gallery/ut58HOs