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While I can't provide a picture of a direct comparison between the two models, I did manage to find pictures of each model compared to a normal sized infantry model.

Bunker size comparison - http://orig12.deviantart.net/5119/f/2012/365/4/9/imperial_bunker_by_spooky777-d5ptlbm.jpg
Fateweaver comparison - https://farm3.staticflickr.com/2933/14078831213_cb9af24a60_b.jpg

From the looks of the pictures, it seems the bunker is about twice as tall as a normal infantry model, perhaps a bit taller. The fateweaver appears to be roughly the same height (taking into account the modified base). It would most likely be possible to hide fateweaver behind the bunker, especially from the perspective of an enemy infantry model.