If this is first time when you read ISCG it would be good to explain what ISCG actually means. ISCG is a term for adapteur which is for mounting chainguide on your bike. In the catalogues you can find terms like ISCG, ISCGold, ISCG03 and ISCG05. First three means the same adapteur.
Main difference between ISCG and ISCG05 is avarage of adapteur with which goes hand in hand distance between holes for screws. ISCG has avarage 59,24 mm and distance between holes is 47,77 mm. ISCG05 has avarage 73 mm and distance between holes 55,92 mm.
Easiest way how to deal with ISCG problem is take ruller or caliper and measure distance between each hole. Also picture which is below can help you.