Both CPUs require 32 bit emulation. AMD CPUs run in either 32 bit or 64 mode, not both at the same time... 32 bit programs under x64 are emulated in a similar way that 16 bit programs were emulated under x32. The CPU is irrelevant.
The difference between the CPUs is that the AMD acts as a natively 32 bit CPU until that special bit is set.
The difference between the CPUs is that the AMD acts as a natively 32 bit CPU until that special bit is set.