Hi Burhan num mina llah
Well i guess then both should be the same.The only difference i personally understand is that practically it may be possible to configure the COADM only once and once configured it may not to possible to reconfigure it again while for the reconfigurable one as the name suggests,it may be possible to configure it multiple times as per the system requirements making it more dynamic and flexible compared to COADM.
You can take your guide’s help to decide if your system requirements can well be served by use of COADM.
Regards