I was looking at the [20 precepts of karate](https://en.wikipedia.org/wiki/Nij%C5%AB_kun) and I really like this one:

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> 空手の修業は一生である 
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The translation should be something like: 

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> Karate is a lifelong pursuit.
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Looking for it on google.co.jp I've been suggested for:

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> 空手の修行は一生である
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> 
> 

Which is the difference between the two kanji?
Is the meaning correct (and the same)?

PS:  

Sorry but I don't have any knowledge of the language, not sure about the tags or if the question is even "correct"!