Node equivalence to avoid contact element between two or more 2D shell element

Sir,

I have a model of three different material and thickness components bonded each other  as shown in below image. I used two different connection method.

Method 1- 2D element of three mid surface elements connected with bonded contact.

Method 2- 2D element of three overlapped elements ( two duplicate of middle component elements)  connected by node equivalence and element offset used to maintain cross section thickness.

After solution, result of both method are different.

Please suggest witch method will give correct result.