No difference in metal thickness. Identical metal parts. Valve color is different for sure and this is the only difference I can tell. I guess I can cut the filters and check the media but don't want to waste new filters.
Edit: I just weighed the filters and supertech filter is 6.2 while mobil 1 is 6.9 oz. So, I guess there could be some difference in media or minimal difference in thickness (we are talking about 10% difference).