Is SSH public key need to be the same each time I do push/pull with git repository?

I am just started using Git, so I apologize if it is a newbie question.

I am using two different machines to commit c开发者_Python百科hanges to remote Git repository on github.com. Do I need to use the same SSH public key (the one I mentioned for my repository on Github)?

No -- if you go to your GitHub accounts page, you can add as many SSH public keys as you want.