Although all SKUs may look identical, their sizes are very slightly different between them due to changes in the cooling solution and GPU. We've compiled all the size differences here so potential buyers can more easily compare the Blade 15 versions before committing to a full purchase.
https://www.notebookcheck.net/Razer-Blade-15-series-now-has-a-total-of-four-different-thicknesses-depending-on-the-SKU.393891.0.html