Aside from being harder to install straight, two single pins will work just as well as a two pin piece - and once soldered properly, should not be a problem.
The two 2 pin connections are primarily used as physical support for the "free" end of the display board. If I remember correctly, they do not have any electrical function.
When installing a single row of pins, you have to be careful of vertical alignment in one direction - but when you have single pins, you have to worry about that for 360ยบ. I would suggest that when you mount these 2 pins on the display board, you use the mating sockets on the main board to locate and align them. Just lightly plug them together for this, as they are a very firm fit and if you want to check anything, the 40 pin connector is not easy to separate. (If you ever need to, be patient, take it gently and try to separate it evenly.)