首先，thesameas不光指數量，還指其他方面的相同。這是二者最明顯的區別。

第二，用作數量之比時，much不可數，往往強調“多達”，thesmaeas往往指一樣多。從這點上講，thesameas用法比較簡單，即單純地指一樣多，但asmuchas的很多種用途。請見下面例句：

1)pleasehelpyourselftoasmuchofthemeantasyouwantindicateswhateveramountyouwish.

2)howevermuch,muchas.eventhough,nomatterhowmuch,

3)asmuchasihateto,imuststayhometonight,

4)howevermuchithurts,yououghttoadmityouwerewrong,

5)muchaskarenwouldlovetoseeus,shecan"tgetoutofherpriorcommitment.