Another option, which may be slightly better, for copying your old disk to the new would be to simply use the dd command from the Live Session.
This will copy the partitions and everything.
dd if=/dev/sda of=/dev/sdb bs=4M; sync
where sda and sdb are the actual designations for the drives in your box.
"if" is input file
'of" is output file
don't mix them up or you will have 2 blank drives.
You don't want to worry about format of the new drive. All that will be copied from the old drive.
I think this is a better solution as it is one process. Old Unix command. Easy on resourses and easy on the old drive.
Good luck and HAVE FUN.
I would be getting another drive, maybe a bit bigger, and using it for backup storage, perhaps with complete system backup of both installs.
You may want to back up your data and then do clean installs of the systems too. Advantage to that is that you could install and then keep your data files, all of them, for both installs on another, larger partition. If you are installing on only one partition each OS could easily be under 20 gigs (depending on how many extra packages you install -base install is under 5 gigs).
With all your data on only one partition it makes for easier back up of that data and easier recovery of that data if that is ever needed.
You simply put that partition in both installs /etc/fstab to mount on boot up.