they are quite simiar..
we all following by 8 dights..for example ..my HK number is starting 6 , 8, 9 , 2..
sinagore starting 6, 8 , 9,
HK user will dial 96xxxxxxx, 98xxxxxxx
Singpore user will since connect to HK ..so will dial 90060656xxxxxxx (0060 is our long distance IDD service)..
therefore do we need to setup different leading digits