Let $\mathbf{v}$ and $\mathbf{w}$ be vectors such that
\[\operatorname{proj}_{\mathbf{w}} \mathbf{v} = \begin{pmatrix} 7 \\ -2 \end{pmatrix}.\]Find
\[\operatorname{proj}_{\mathbf{w}} \begin{pmatrix} 7 \\ -2 \end{pmatrix}.\]
Since $\begin{pmatrix} 7 \\ -2 \end{pmatrix}$ is the projection of $\mathbf{v}$ onto $\mathbf{w},$ $\begin{pmatrix} 7 \\ -2 \end{pmatrix}$ is a scalar multiple of $\mathbf{w}.$  Therefore,
\[\operatorname{proj}_{\mathbf{w}} \begin{pmatrix} 7 \\ -2 \end{pmatrix} = \boxed{\begin{pmatrix} 7 \\ -2 \end{pmatrix}}.\]