Coach positions have been reversed for 12163/12164.
At Dadar, 12163's coach positions used to be General-AC classes-Sleeper classes-General-Engine. Now it's the reverse, that is, General-Sleeper Classes -AC Classes-General-Engine.
From Chennai, 12164's coach positions used to be General-Sleeper Classes-AC Classes-General-Engine. Now it is General-AC Classes-Sleeper Classes-General-Engine.