Statusmatch.com (the third party that approves or denies the matches) will ask you to send a picture of your account dashboard. If they see an account with 0 qualifying flights and 0 points, they’ll know it was probably matched. If you already have EBS status and match up to EBG with another program, as well as a bunch of points on your EuroBonus account you might just get away with it, but even then the expiry date on your EBG card would be a giveaway to an astute reviewer.