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Indeed, with the latest LHCb data one has for these two modes very different longitudinal polarization fractions, $f_L^{exp}({\\rm \\overline{B}}_s \\to {\\rm K^{*0} \\overline{K}^{*0}} ) = 0.24 \\pm 0.04$ and $f_L^{exp}({\\rm \\overline{B}}_d \\to {\\rm K^{*0} \\overline{K}^{*0}} ) = 0.74 \\pm 0.05$. 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Indeed, with the latest LHCb data one has for these two modes very different longitudinal polarization fractions, $f_L^{exp}({\\rm \\overline{B}}_s \\to {\\rm K^{*0} \\overline{K}^{*0}} ) = 0.24 \\pm 0.04$ and $f_L^{exp}({\\rm \\overline{B}}_d \\to {\\rm K^{*0} \\overline{K}^{*0}} ) = 0.74 \\pm 0.05$. 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