I have (by misstake) bougt a domain that only differs from another domain by one letter. We supply the same services also.

Is this ok, or should I get another domain?

I believe thay could be considered as different domain names there. Nothing to worry about. Or have you been contacted by them?

You should not use that domain, if their business is trademarked or copyrighted, then they may file a complaint and you may need to release that domain in favor of them.

Can you share domain name? maybe in private?

I was buy utublog.com this is a typo ha ha