Start at the beginning.
So it originally had an NCDC2013 and what type of screen? Both paired together?
The replacement is an NCDC2013 and a CID, which are paired together?
If yours had a GID (see Display Types in Info sections of forum), then you need to check if you have the CID cable tucked up behind the screen area of dash - usually wrapped in masking tape, but not all have the CID cabling. If you don't have the CID cabling, it's not hard to fit, but I'm reading between the lines that it may be a struggle for you? The CID will work without it, but you won't be able to use the map display of the sat nav.
There is a guide how to get the dash out to change the screen.
Option 2, if yous has no sound, swap the lower rear board of the top unit over inside the NCDC. That board is not coded, so can be swapped at will. I get a feeling I wrote a guide, but that might have been NCDC CD Charnger board