and mean the same thing in this situation, when used as 'a little bit' or 'another'. See the examples below meaning "Let's try just a bit more".
There is a situation where they are not interchangeable, and that's when you're using the other meaning of , "already". The following sentence means "I already wrote it." and only the first version is correct.
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Or when you're using another meaning of , "after". The following means "How soon will you arrive?" (lit: After how long will you arrive). Only the second version is correct.
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