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1) The credibility of these witnesses is not the same.
(These witnesses are not equally credible.)

2) The credibility of these testimonies differs.
(These testimonies are not equally credible.)

3) The value of these objects is not the same.
(These objects don't have the same value.)

4) The value of these objects is different.
(These objects don't have the same value.)

Which of the above sentences is grammatical and corresponds to the given meaning?

Gratefully,
Navi

(1) is semantically strange: logically, only levels of credibility can be compared.