Hey Frank, not 100% sure, maybe someone of the distributors may be able to help.
I honestly thought I was getting a10-128 but when I got it home, it was a 10-117.
What ever you do, don't get the 10-107 as it doesn't have the other block, yes you can buy them extra, but it'll cost you more that way.
I just googled them, and the only thing I can see that may be a difference is the 10-117 doesn't seem to have a locking option?
Hopefully someone else with more knowledge of them will help you
John