of the same size or the same size

Hello there

I'd like to know if it's correct to say :

1. The two products are of the same size.

2. The two products are the same size.

3. The two products have the same size.

4. The two products are of different sizes. 

5. The two products are in different sizes. 

6. The two products have different sizes.

Thanks a lot. Happy Easter   

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