You can interchange, if you could use one assume you could replace it with the other. The only define difference for me is I will use entire if I could have used whole but to further emphasise. It sounds greater when someone says "The entire planet vanished" rather than if they were to say "The whole planet vanished". If you were trying to make something sound even greater you would say "The whole entire planet vanished" which in turn makes the word "entire" feel as if that is the most important part of the sentence. Showing the large amount. Sorry if i didn't explain this properly, I had never actually thought about it until now lol.

There are no real concrete differences between "entire" and "whole." It could be suggested that entire is slightly more emphatic. "I ate the whole pizza." "I ate the entire pizza." "This is the only one in the entire world." "This is the only one in the whole world." Really there's almost no difference when used in that context. When you begin talking about a piece of something, that would be "a piece of the whole," because "a piece of the entire thing" is the alternative, and it's quite unnatural (though still correct).

Not sure which use you mean, but maybe they can be used similarly most often. . "Entire" can be used as an adjective meaning almost the same as "whole", unbroken, undivided, not corrupted. . . In it's entirity, I guess has no "whole" equivalent.