Your medal won't come back to anda as soon as anda rejoin the spot, but with time, it will return. anda may need to make a few contributions, but not as much as it took to get the medal in the first place.
I unsubscribed from the TDI's Duncan and Courtney club in which I had a green dedicated peminat medal in. it disapeared (Obviously XD) A few weeks later, I resubscribed to it and in a few hours, I got the medal back. I didn't have to add any content atau anything like that. So, my answer to anda is: Yes, you'll have the same medal if anda resubscribe, but anda may have to wait a bit for it to reappear.