On page SEO is done to make changes to your websites content,title Etc. So focusing on updating your content will help you alot.Although having the same URL will not affect much but if you have more content then to share then why not giving more Url's.
It not will effect to SEO, It will efect to SEO if you have link on page that leads to diffrent link..
Looping links like you is very risky cause if Google's crawler finds out about it your site will get a bad impression.