Does the Country you Check Google Ranking from Alter Results

[Alimoqi]

So I have a guy I am working with to rank his website that is a .org and we are trying to rank it on Google.com. The results that he gets when he searches on google.com are putting his site lower than when I search for it. I am making sure he is not logged into Google and he said he cleared all of his history since I know that Google will change the results based on that. I need to know that if the fact he is simply checking from the UK and I am checking from the US that the SERP will be different. As I said we are both checking from google.com and not .uk or anything of that nature.

I appreciate any insight you guys can give me on this.