Is x86_64 memory map same as x86's?

Question

Yes, x86 is 32 bit. Wrote a small kernel for VGA, keyboard IO, and mouse IO. But, x86_64 is 64 bit. The main difference is that the registers are extended to 64 bit and there are more of them. The x86_64 instruction set has a few more instructs along with x86. But here's the thing - is the memory map the same as x86? If no, can i have the specs?