The boss hanger for Bladetech also works for Comptac holster, they sell a separate hanger plate for Safariland holsters also, I have and use all 3 brands of holsters.
Most of the gear out there is proprietary as in they are designed for their specific product, one that comes to mind is the older Safariland 2 piece belts where the velcro was the opposite set up to other brands. You do get a bit more adjustment with the Safariland hanger but both are quite good to use, much better than the OEM DOH set ups. Pic attached is my G17 with Redfield sight on dovetail mount in the Safariland 5197, shows plenty of clearance off the sight.