yeah...its just some similar.but the differents are
1)syaoran had clone while sora not
2)syaoran has a bad side while sora not(or yes???)
think thats all i can remember.........
Actually in KH-2.....[WARNING : totally SPOILER!! for those who haven't play kingdom hearts-2 and planning to play it and for those who haven't reach the last place ]
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this is quite complicated and difficult to understand if you haven't play kingdom hearts -1. Anyway, Sora has other self in separate body called 'Roxas', frankly, Roxas is Sora's 'Nobodies' that was born when Sora become 'Heartless' in the first series (in short, these 'nobodies' and 'heartless' things can be said the antagonist in the story). So, it can be said that this Roxas is suppose to be evil 'clone' of Sora, though they have totally different appearance, the same things is only the way they fight. BTW Roxas 's name is the anagram of Sora plus X word. But in fact, this Roxas is not a bad guy after all, the organization he's in is the bad one.
So overall, SOra and Syaoran do have a lot of similarity ^^