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Similarities:

Both give an overview of the structure of noun clauses.

Differences:
The textbook goes into more detail about the uses of noun clauses and how they are used (subjects, subject complements, objects of verbs, and objects of prepositions).

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Similarities:
They both give examples if verbs that can be used in that clauses (i.e., agree, believe, and decide). They both talk about that-clauses being followed by an adjective. They both talk about that-clauses as subjects.

Differences:
The reading goes into more detail about how that-noun clauses can be used (verb+ that-clause, person + be+ adjective+ that-clause, it+be+ adjective+ that-clause, and that-clause used as a subject). The reading gives formulas for that-clauses. The textbook explains areas where people may have issues with that-clauses(hot spot).

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A very good example on how to learn making polite requests in English is when using noun clauses.

The following exercise seen in the textbook uses one picture but with that one picture, there is a context in which students can formulate indirect requests using noun clauses.

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Similarities:
From both the reading and the textbook, this section is explained last as noun clauses types.
Both use similar approach to explaining if/whether noun clauses as they used with wh noun clauses.

For example, textbook in both noun clause types shows:
1. form
2. Similar "Hot Spot" section
3. Indirect Requests
4. Using "I wonder"
All four sections are used in the same order in both noun clause types.

Differences:

The reading talked about the formal and informal use of if/whether. The textbook never mentions such differences.

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- The textbook includes a very useful 'Grammar Hot spot' where they warn to pay particular attention to the distinction between 'that' noun clauses and 'that' adjective clauses.
This is a very useful point to include, especially considering that in fact, in real world daily usage, that clauses are the most common types.
It also warns about the fact that a the noun 'that' clause cannot be the object of a preposition, and about a very important common phenomenon that happens with noun clauses: verbs that are used with gerunds/infinitives instead (like I want you to help me and not *I want that you help me).

- In terms of practices and examples, in the explanations there are often sentences that are not contextualized. However, there are practice exercises with useful authentic texts, like letters that had been sent to a literary magazine, and learners have to identify and classify the different noun clauses.

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Similarities:

Like the reading, the learner textbook emphasis on wh noun clauses was on Word Order after wh words

Differences:

The reading talked about wh+ever whereas the textbook focus was on verb tenses agreement.

For example, the noun clause use past tense if main clause uses past tense.