suss

Here is what I want to do:

Install vista ultimate x64 on my computer.

Here is what I have:

vista ultimate 32 cd and valid key
vista business 32 cd and valid key
vista home premium x64 and valid key

Is this possible:
boot from home premium x64 cd and type in my ultimate key to install
ultimate??

I have heard that the key is the same for 32 or 64, the real question is
does the home premium cd have all the editions on it.