Documentation doesn't explain what ImportRow does

Some unanswered questions by this documentation: must the DataRow be from the same DataTable you are importing to, or can it be from a different table? If from a different table, must the schemas be identical? What happens if the schemas are different between the two DataTables?

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* ID: c6676714-cb1b-60a2-e5bc-e8066099f3f7
* Version Independent ID: eda92621-9df1-a3bd-ece2-a21a077ae519
* Content: [DataTable.ImportRow(DataRow) Method (System.Data)](https://docs.microsoft.com/en-us/dotnet/api/system.data.datatable.importrow?view=netframework-4.7.2#System_Data_DataTable_ImportRow_System_Data_DataRow_)
* Content Source: [xml/System.Data/DataTable.xml](https://github.com/dotnet/dotnet-api-docs/blob/master/xml/System.Data/DataTable.xml)
* Product: **dotnet-api**
* GitHub Login: @douglaslMS
* Microsoft Alias: **douglasl**