Out of interest which source did you use to establish that these 2 locations "overlap"??
I have been there 3 or 4 times. The two locations are about 40 meters apart and as you can see on the 2015 boundary clarification pdf, their core zones are radiuses of approx. 250 meters.
I hadn't realised it was formatted in a way that the data could be extracted, so I have done that and hopefully will get a chance to clean it and convert the co-ordinates so we can tidy up a lot of the problems we have with it at the moment e.g. the big batch in the sea off the Alicante.
The thing is, when UNESCO or whoever extracted the data from the original pdf submitted by the state party, many "ls" became "Is", "0s" "Os", etc. Which partly explains why so many locations are so off (of course, many names are wrong too!).
The big batch in the sea off Alicante is easy to explain: when they converted the UTM coordinates to Lat/Lon they got the wrong grid zone (31 instead of 30 I think).
The good news is that I have already done the dirty work (including typo correction). I can send you the kml file, though it needs a little further cleaning. Only 18 locations are 100% correct (those I have visited), the others are always approx. 200 meters off (sometimes much more).
PS: I suspect the state party to be deliberately vague about the locations (many of them have been vandalized in the past).