Could somebody explain me the difference between その上 and 上に?

In "A Dictionary of Intermediate Japanese Grammar" it is written that they can
be used interchangeably, but I am not sure if it meant that they are always
interchangeable or that there are cases where they can be used indifferently.
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2018-06-18T13:12:24.587
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2019-11-04T06:54:30.463
2019-11-04T06:54:30.463
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question
grammar word-choice conjugations
What is the difference among その上 and 上に?
その上 is a conjunction that means "in addition (to that)", so it is used like
私は英語が得意、その上、絵も上手.

A noun 上 has many meanings and 上に is "a noun 上 + a particle に".
<https://dictionary.goo.ne.jp/jn/17464/meaning/m0u/> So there are many usages
of it.

You can say 私は英語が得意な上に、絵も上手. This meaning is the same as 私は英語が得意、その上、絵も上手.
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2018-06-19T17:37:42.400
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2018-06-19T17:37:42.400
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