As mentioned above vs As mentioned previously

As mentioned above /  As just mentioned
通常用來指前一、兩段中剛敘述的內容，或前幾個句子所提到的內容

As mentioned previously / As mentioned earlier
是指前幾個段落或前幾頁所提到的內容

above-mentioned, aforementioned, aforesaid adj. 「上述的」或「前述的」