You can run any number of O/Ses on a system...but you can only be using one at any time.
I believe in spreading risk...risk of hard drive failure is always a possibility. So I put each O/S I install on a different hard drive (I have more drives than I need), usually preferring the smaller drive for O/S installs. If I have to use a large drive (120GB or more), I create a 20-50GB partition for the O/S, depending on what I intend to install and what else I intend to put on the system partition.
It's entirely up to you...to see value in having two installs of the same O/S on one system.
<<...will I be able to move files from my new SSD drive to the Samsung...>>
Depends...on what types of files you refer to. Programs, no. Data files, yes.
If you do go with two of the same...be aware that, when booted into, each will see the other install...as just another storage drive. You cannot run programs on one install from the other.