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The functions $f(x) = -(x-4)^{2} + 3$ and $g(x) = -(x-4)^{2} + 5$ are graphed in the same $xy$-plane as $y = f(x)$ and $y = g(x)$. If $(h_{1}, k_{1})$ is the vertex of the graph of function $f$ and $(h_{2}, k_{2})$ is the vertex of the graph of function $g$, then what is $k_{2} - k_{1}$?$\newline$Choose $1$ answer:$\newline$(A) $-2$$\newline$(B) $0$$\newline$(C) $2$$\newline$(D) $8$