Do Adobe Substance Painter 3D materials work on the Allegorithmic Substance Painter v1.7.3 ?

Hello, I still have the perpetual license for the older Substance Painter 3D software (Version 1.7.3).

I would like to know if the newer Adobe Substance Painter "Material" files work on the older v1.7.3 version.  I've tried to load a couple of materials - ".sbsar" files, and I can't seem to get them to show up in the Shelf under materials.

Any suggesitons?

Thanks you.