Hey Paul, Have you tried using the "Raster Compare" tool? If so (and to no avail) then I'm not sure how useful the following suggestion will be but I would recommend converting the raster files into a point shapefiles and using combinations of the "Point Distant" tool and/or "Spatial Join" tool (once Spatially Joined you can run field calculations on the two columns with the different values to find the points with the ranges you are looking for, once done its pretty easy to generate a raster from those points using the "Point to Raster" tool). -Matt
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