I sent an email to Air Berlin and received the following answer :
Dear Mr. X
Thank you for your reply.
The Aegean Gold status corresponds to our Silver status. If you have a elite or elite plus card from Turkish Airlines, we can offer you a status match to topbonus Gold, otherwise not. I´m sorry.
I look forward to hearing from you. Best regards
It seems inconsistent with report posted on January 2nd, 2014
Air Berlin requests a copy of the gold card sent to them. Unfortunately, I have never received my Elite card from TK … so all together I was not able to match to Air Berlin Top Bonus Gold for 4 months :-(
on January 12, 2014