Both indicate lack of concern. The first is an abbreviated form of "There's no way I could care less". The second states the thought a slightly different way, without any abbreviation.
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mitsuwao23I liked your explanation about "could care less" but I am wondering if it is your version of how to interpret the expression, or it's more like a general fact widely accepted among people.There are no "standard" and "accepted" explanations of many of the strange expressions we have in English.