Imposter, seems right. People would think it was the same person if they never paid attention to the rank of the two accounts.
Even if the OP wasn't trying to impersonate anyone else I really can't trust it as well as reason. I didn't try to tag it with anything, but maybe this would be a good option to prevent something the main account that has the same username would not expect.
In this case, your account is an imposter. Such accounts are created for the purpose of deceiving users or scamming supposedly in the name of the person whose account name the scammer is copying. Such accounts are usually subject to a ban on our forum.
I wonder what the next step, does the OP really have to be banned for this case?