Building/Testing against multiple frameworks consideration

When reading the documentation about building packages against multiple target frameworks I came across this consideration:

> ✔️ CONSIDER adding a target for net461 when you're offering a netstandard2.0 target.
>
> Using .NET Standard 2.0 from .NET Framework has some issues that were addressed in .NET Framework 4.7.2. You can improve the experience for developers that are still on .NET Framework 4.6.1 - 4.7.1 by offering them a binary that is built for .NET Framework 4.6.1.

Now I am wondering if it is also enough to test against these frameworks (4.6.1 - 4.7.1).
Will this provide the same confidence as building the package for 4.6.1 and 4.7.1?

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* ID: 5b3638c9-ea3c-1c9e-2763-5c3e8e965663
* Version Independent ID: aff99d6b-9471-9277-160b-670ee8028b53
* Content: [Cross-platform targeting for .NET libraries](https://docs.microsoft.com/en-us/dotnet/standard/library-guidance/cross-platform-targeting)
* Content Source: [docs/standard/library-guidance/cross-platform-targeting.md](https://github.com/dotnet/docs/blob/main/docs/standard/library-guidance/cross-platform-targeting.md)
* Product: **dotnet-fundamentals**
* GitHub Login: @JamesNK
* Microsoft Alias: **jamesnk**