It is no big difference really. It is only variations of the same thing, which means that you don't have to use more than one choice.
What your are using is rather a matter of how your development process look like and what requirements that are stated for the different development phases.
Walk-through is usually performed by "following" the code. The author should explain what the code is supposed to do from line to line, procedure call to procedure call etc. etc.
Inspections and reviews are basically the same, i.e. you have a meeting where people give their remarks of the code that they have gathered when they were reading it through (before the meeting). You can compare this to a review of any kind of document.
At our company reviews are more formal and must be documented in a review record. Inspections might be less formal and not documented.
In our development process we demand code reviews for all software components.
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