How to tell difference between SGE 400/3 and SGE 400/3 BB?

Looking to purchase the BB version of this mask and I could use some information regarding the bromobutyl (BB) face seal vs the regular silicone version of the mask.
How can I differentiate between these two? I have heard that BB rubber is a flat/matte black, while silicone is reflective and shiny. Does anyone know a reliable way to ensure I have the correct version of the mask? As far as I know both versions of the mask only say "400/3".

Thanks.

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How to tell difference between SGE 400/3 and SGE 400/3 BB?