May be this is my experience in doing SEO for more than 10 years. Google rank need many factors, some of important factor is how many quality backlink to your website. Its doesn't matter what domain extension that we used on website , com, net , org , info , and other extension have same opportunity to get high ranking in search engine.
But , there is a little different for extension based ccTLD, we could have better rank on certain country / area when we also build strong backlink as we do in gTLD like .com,net,org or .info and other. Google SEo parameters says that ccTLD is targetted by specific country , its different from gTLDs or nGTLDs, where gtlds and gtlds seem to be targetted and ranked globally .
That's why there is any different search engine result for some keyword or different rank when we check via google.co.uk, google.com , google.de , and many google site based ccTLD.