Of course they are semantically different. They represent completely different kinds of motion. But the question is whether they have any semantic elements which are uncancellable.
i.e.
1) Can an object only fall downwards?
2) Can an object only sink downwards?
3) Can a flying object only land on a solid object?
Another example we could throw out for discussion:
4) He was crawling on his feet but not on his hands. This he learned, of course, after toddling on hands and knees.
James Christian
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