Sorry about the confusion . . . I read you won't be moving the OS as "you" meaning "I/me." What you intended was "you" meaning the "procedure/equipment."
P.S. It does make sense that a older OS would not, by default, overwrite (or copy to) a machine which has a newer version of the OS.
Thanks again for your input.
That's right; sorry for being a bit obscure.
Macs are designed with zero backwards compatibility (although I believe there have been reports of some having been able to boot into a 1/10th point older version of OS X), so "makes sense" gives way to "virtually impossible."
I'm happy that your move worked out OK; I hope you're happy with your MBP...great machine.