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I don't think Unity's shaders are compatible in Houdini since they're unique and distinct renderers 

Follow up answer: So you can't use the URP shader but you can use the /mat/principleshader and set all the relative textures on the object. Then on your object assign the shader. If you have multiple materials on a single object you can do the same at SOP level with the material node and multiple /mat/principleshader.