Hillshade coming out pixelated after using the Mosaic to New Raster tool to merge DEM's

[SeanM]

I am trying to create a hillshade from  DEM datasets. When I run the hillshade tool on just one of the datasets, it turns out fine. But when I use the Mosaic to New Rater tool to merge 2 DEM datasets and then run the hillshade tool, it turns out super pixelated. I'm not sure what's causing this, and I've changed every resampling method that i can find to bilinear and I am stumped. 

Attached are the hillshade using a single DEM dataset, which turns out fine and the hillshade after merging the same exact DEM dataset with the one next to it for a larger area than the first. 

[DanPatterson]

If the dems were side-by-side, they should have the same properties and you shouldn't have had to change any of the optional parameters... What were your too inputs?

Mosaic To New Raster (Data Management)—ArcGIS Pro | Documentation

[SeanM]

Here is the dems side by side, the reason I'm running the mosaic is because they both have a different min and max elevation so the symbolization isn't the same. 

[SeanM]

And the DEM looks fine after the mosaic (here it is clipped to my area of focus so its smaller), but the hillshade is what turns out bad.