They are not Touch Twins. I have a few and they are identical to SN's, down to the "old" SN code, nib, barrel shape and color. I get them from eBay when one of my SN's dry out because I hate that you either need to buy an entire pack or the refill ink. What I did with them was relabel the end with a cut out, colored in label and marked it with SN's code. Since you already have all of the SN's, you won't get any new colors by buying these. You can see that by comparing the SN color chart the number in parentheses) to the Touch 3 options.
I know I may get slammed by SN fans for this.
Last edited by Leeann34; 01-22-2013 at 08:23 AM..
Reason: Added more info.