I cannot think of anywhere they are not interchangeable, granting that they fit into the sentence grammar.
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MUSCOVITEI hope "step on it" is absolutely acceptable in casual English (it is slangy but not rude/offensive, etc.)?'Step on it' is more unequivocally impatient than the others (i.e. it is less amenable to amelioration with tone of voice).
MUSCOVITE(1) Hurry up (can I omit 'up' here?)Yes.
MUSCOVITE(