We can't predict your chances as it will depend on the CO on the day of your interview.
You have done the right thing by correcting the error in the DS260. I would also email KCC to let them know why there is a discrepancy because they will pick it up and will flag it to the embassy. At least if you have emailed them upfront about the error, they know you're not trying to hide it AND they can do whatever checks they need.
Finally, make sure there are no other issues / mistakes / errors. COs may forgive one error but multiple errors start to look like fraud and you'll go into AP or - worse - be denied.