There is no marked qualitative difference between the two.

二者在质量上无明显差别。

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The quantitative change has beguntomake a qualitative difference.

数量上的变化正带来质量上的变化。

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The quantitative change has begun to make a qualitative difference.

量的变化已经导致质的区别。

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There's a qualitative difference here.

它们之间存在着性质上的差异。

耶鲁公开课 - 旧约导论课程节选

Scaling in the social sector means understanding the best approach to making a more meaningful qualitative difference with respect to a social issue.

FORBES: What's Your Scale For Good?

There is a huge qualitative difference between an economy built on natural resource extraction, where the populace is a cost center, and an economy built on productive labor by the population, where increasing capabilities of the society leads to more wealth.

FORBES: Why Have The Islamic Countries Failed To Develop Even With Resources Like Oil, While Countries With No Resources Like Switzerland Have Flourished?

These so-called quantitative traits are under the control of a number of different genes acting in concert as opposed to qualitative traits such as human eye colour, where a difference in a single gene produces a single, sharp distinction.

ECONOMIST: A genetic game of chicken