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1.
We take pottery classes in the same room in which we take our science classes.
We take pottery classes in the same room that we take our science classes in.
Which of the above sentences is grammatically correct ?

2.
"I bought the same car as yours."
I read this sentence in the Oxford Advanced Learner's Dictionary.
Is this grammatically correct ?
I recently posted a question regarding a similar sentence. The sentence was "Our children go to the same school as this."
If the sentence I quoted from Oxford is correct why can't the above sentence "Our children go to the same school as this." be correct ?
Comments  
1. Which of the above sentences is grammatically correct ?-- Both are fine. The first is very formal; the second is more common and less formal.

2. Is this grammatically correct ?--Yes.
If the sentence I quoted from Oxford is correct why can't the above sentence "Our children go to the same school as this." be correct ?-- Because it is indeed the same school. The car is just the same model, not the same individual vehicle.
"Our children go to the same school as this."

Could you please tell me how to express the similarity correctly?
Teachers: We supply a list of EFL job vacancies
Our children go to this school.
But wouldn't it suggest that children go to school which you point at, would it?

What I would like to know is something like- our children go this type of school- would it be correct?
go this type of school* should have been go to this type of school
Students: We have free audio pronunciation exercises.
Our children go to the same type of school as this. -- OK