Very interesting. The top bar of the UI is almost identical. There is only a slight difference in color of the bar and in the shape of some icons, but the menu and the names of modules are exactly the same. Very, very interesting.
But the are some significant differences in the tools section shown on the right side of the User Interface of those two programs. The available tools differ substantially.
I have not downloaded or installed Neptune SystemCare Ultimate.
My comment is based solely on the screenshot provided by you.