Yeah bad choice , EK will pick up on your duplicate accounts eventually and this could get you banned as this is a clear violation of T&C's of the Skywards program. I have had a ongoing issue with BAEC , Amex made me a second BAEC account when i took out a credit card with them and i have been trying to sort things out with the multiple accounts while merging the accounts , and the Amex created one has a DOB error and that had to be sorted out as well, and this caught the attention of the Fraud team. Long story short , accounts locked by the fraud team and about 4 weeks downtime on both accounts trying to sort everything out. ( Not Skywards related , but still proves how time consuming it is to sort a honest mistake out , while yours was purely to trick the system.)
What was your reason for making a full account ?