An ad that got the first click earlier than the second one remains in the auction, the second ad is being rejected. In addition, the ad that is active always has an advantage.

If the first ad has a first click date later than the first click date of the second ad, but the first ad is active and the second ad is stopped, then the second ad will be blocked.

But at the same time, if the original ad is not active within the last 14 days, then a duplicate is allowed.