If $a=\sqrt{7}$, what is the value of
$\begin{aligned}
& \left((\sqrt{61}+3a)^3-(\sqrt{61}-3a)^3\right)^2 \\
& -\left((\sqrt{61}+3a)^3+(\sqrt{61}-3a)^3\right)^2?
\end{aligned}$

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