Two objects of the same size will always have the same mass ? is this statement correct

No.  The statement is not correct.  It is incorrect, false, inaccurate, ludicrous, illogical, and absurd.

A balloon that is 80-ft long, 40-ft wide, and 30-ft high when inflated has much less mass than my house has.

Moreover, a small flat rock that is 1 meter long has substantially more mass than the pillow on my bed has.

i just did an experiment like this in my science class. also the answer is yes, it will get separated because they are two opposites meaning if they are opposite they can not attract.

hope this .!