The answer is no. There are many differences between the typical Golden Retriever and the typical Flat-Coat Retriever.
Besides the obvious...color (blonde vs. black), there a couple of other noteable differences.
Energy level (the flat-coat is a very high energy breed).
Size (flat-coats are taller and more slender then the typical stocky Golden)
The most noteable difference for me though is their coat. Kabo has a thick double layered coat, which means that he sheds a lot. Flat-Coats have a long single layered coat, which means that he sheds a lot. So what is the big difference, you ask?
That's Kabo's on the right, if you didn't already know.
Holy double coat batman!