Nonononono no.... no
A class C is an RV built on a van, or sometimes a truck. It has a van, or truck, front end and is a real RV from the cab back. Most Cs do have a cab-over bed, some have an entertainment system, some have both, and some have nothing at all over the cab.
A Class B is a van. It looks like a van. It is the size of a van. It may have a raised roof, or not. once inside it is still a van but with a bed and a stove and a table and (if youre lucky) a toilet. Just about the only way to tell a class B is more than just a van without standing inside it is to look for telltales like a roof AC, Awning, or Water heater.
Big difference between Class C and B. Some RVs have blurred the lines between the two, however. The Rialta is kind of a class B, but mostly a Class C. The RoadTrek 210 is trying to be a class C, but is still a B.
If it looks like a Van, its a B
If it looks like an RV with a van nose, its a C