个人看法,仅供参考：
两句都正确.语法上也没什么错误,if 和that 都是引导的名词性从句,它们的用法是正确的.要说有区别,那就是这两句话的意义有细微区别.具体地说,这种细微的区别也是由that 和if造成的,也否定词not没关系.给出两句话的参考译文,你可以自己体会一下：
1.法律在事实上是保护销售者的,这还不明确.
2.法律是否在事实上是保护销售者的,这还不明确.
It isn't clear that the law actually protects sellers.
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