Can a rat live in a hamster cage?

I used to have a regular hamster and he died. I am thinking about getting a small rat. I was wondering if I can have the rat live in the hamster cage? Or do I need to buy a new one? Please help! I'm not rich and do not want to have to pay for a new cage, but if the rat will be all claustophobic in the... show more I used to have a regular hamster and he died. I am thinking about getting a small rat. I was wondering if I can have the rat live in the hamster cage? Or do I need to buy a new one? Please help! I'm not rich and do not want to have to pay for a new cage, but if the rat will be all claustophobic in the hamster cage, that wouldn't be could. Could you please help?
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