Too truly grasp this concepts, an understanding of pointers will help. You could look at C (programming language) course which explains pointers? That could help
Not the way I would put/say it. The function is in memory (RAM -> random access memory, this is where a program lives while running). Both these variables point to/reference the function in memory.
Given both these variables point/reference the same function, trying to invoke either will call the same function in memory