the short answer is that there is no real difference.
The practical answer is:
the spreadsheet that was set up by mdlevine has multipe columns so that if someone signed up for a kapital and somebody else also wanted to signup for the same kapital, they would put there name in the next column (or round). Right now YWN has 100% of the sefer Tehillim committed to be said daily in column 1 and if memory serves correctly we are about 1/3 of the way to completing it twice daily.
forward the link to this thread to your family and friends and lets see how many people we can unite in the daily recitation of Sefer Tehillim.