As required, as you can see from the first two screen shots I added item 500000 to both merchants, except merchant ID 999218 has exactly the same items as 155013 in game!
Sorry could find a way of either copying or exporting the table using Heidi
my merchant in the merchantlist
http://prntscr.com/5re9dp
copied merchant in the merchantlist
http://prntscr.com/5re9ww
my merchant from npctypes
http://prntscr.com/5reasn
copied merchant from npctypes
http://prntscr.com/5rea7e