Pbr to Brdf shaders

I was wondering if there is a way to convert one shaders to brdf? (Or if that’s even possible)

I am not an expert, but aren’t BRDF shaders a subset of PBR shaders? As in BRDF shading is a form of physically based rendering? Or am I missing something here?

You should probably have a read of this

As above - PBR shaders are usually constructed using one or more BDRF/BSDF.

I’ll read into that, thank you!