The table shows the volume of two similar solids, right circular cylinder $A$ and right circular cylinder $B$. The radius of right circular cylinder $A$ is $4$ units. The surface area of cylinder $A$ is $k\pi$ square units, and the surface area of cylinder $B$ is $n\pi$ square units, where $k$ and $n$ are constants. What is the value of $n-k$? (The surface area of a right circular cylinder with radius $r$ and height $h$ is $2\pi r^{2}+2\pi rh$.)