Is there a difference between the PS3 slim models?

Question

Is there any difference between, for example, a 160GB model and a 320GB model aside from the HDD size? Does any model have newer, more powerful components?

Wikipedia suggests that there isn't a difference, however I'd like to be sure.

Answer

All slim models are identical. Only the HDD capacity will vary.
You can have the list of models here.

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