Does there exist a molecule of formule XαYβ where X and Y are elements that are also found in molecule XγYδ?
$\ce{GeF2}$ and $\ce{GeF4}$
$\ce{GeCl2}$ and $\ce{GeCl4}$
$\ce{GeBr2}$ and $\ce{GeBr4}$
$\ce{GeI2}$ and $\ce{GeI4}$
$\ce{SnF2}$ and $\ce{SnF4}$
$\ce{SnCl2}$ and $\ce{SnCl4}$
$\ce{SnBr2}$ and $\ce{SnBr4}$
$\ce{SnI2}$ and $\ce{SnI4}$
$\ce{PbF2}$ and $\ce{PbF4}$
$\ce{PbCl2}$ and $\ce{PbCl4}$
$\ce{XeF2}$ and $\ce{XeF4}$
$\ce{XeO2}$ and $\ce{XeO4}$
Silicon dihalides ($\ce{F}$, $\ce{Cl}$, $\ce{Br}$, $\ce{I}$) have also all been prepared in the gas phase, but are much less stable than the tetrahalides.