For all intents and purposes it might just as well be (or remain) two airports. The do indeed share the runway but this is of little relevance to the average traveler.
With regards to the transfer desks... They are located (as can be seen on the picture) where the waiting area for the bus is. Or are there more transfer areas to the left? I feel silly for not taking a better picture after customs but I figured there was simply no way I could get it wrong. Left --> exit Right --> Transfer...
Whatever it may be, it is clearly marked.