形容薪资或收入的高低与多少用much还是high

请问专家：形容薪资或收入的高低与多少用 much 还是 high？

His wages are as ______ as mine.

His income is ______ than mine.

请问该怎么样填？

第一句填high，第二句填more（much的比较级）。又如：

When wages are high, prices are high.薪资高，物价也会相对的高。《简明英汉词典》

His income is not much, but he manages to live quite well on it. 他收入不多，但非常会过日子。《现代汉英综合大词典》

▲高收入，低收入可用high/low。如：

high/low income groups 高[低]收入阶层《牛津高阶英汉双解词典》

Many families on low incomes will be unable to afford to buy their own home. 很多低收入家庭将会买不起我们的房屋。《柯林斯高阶英汉双解词典》