Other than the build quality (and therefore weight!) I think the only “meaningful” difference between BR and non-BR lenses that share the same optical formula is the AF-r feature. And as of right now, the 40-80 BR is not on the list of supported lenses for AF-r AFAIK... not sure if it could or would be added in future though as I suspect the focal length variability would make Phase’s “modeling” of focus/recompose data very complex.
In short, no, I don’t think there is a meaningful difference with that particular lens.