When acquiring the .NET security updates there is a top-level KB number that includes the .NET sub products.

As an example, For 2-2019, the .NET the top-level bulletin is KB4487078 which includes the 3 sub .NET sub products/kb numbers (KB4483451, KB4483455, KB4483458). The 3 sub kb numbers are included under the top-level kb number.

An acquisition for MS-KB4487078 will acquire all 3 sub kb numbers/patches (KB4483451, KB4483455, KB4483458) under a single bulletin MS-KB4487078.

See the KB article below for more details.

https://support.microsoft.com/en-us/help/4487078/security-and-quality-rollup-updates-for-net-framework-3-5-1-to-4-7-2

Security and Quality Rollup updates for .NET Framework 4.7.2, 4.7.1, 4.7, 4.6.2, 4.6.1, 4.6, 4.5.2, and 3.5.1 for Windows 7 SP1 and Server 2008 R2 SP1 (KB 4487078)

4483451 Description of the Security and Quality Rollup for .NET Framework 4.7.2, 4.7.1, 4.7, 4.6.2, 4.6.1, and 4.6 for Windows 7 SP1 and Server 2008 R2 SP1 and for .NET Framework 4.6 for Server 2008 SP2 (KB4483451)

4483455 Description of the Security and Quality Rollup for .NET Framework 4.5.2 for Windows 7 SP1, Server 2008 R2 SP1, and Server 2008 SP2 (KB4483455)

4483458 Description of the Security and Quality Rollup for .NET Framework 3.5.1 for Windows 7 SP1 and Server 2008 R2 SP1 (KB4483458)

To determine the top-level kb number for .Net visit a .NET kb article on the web for any of the .NET products and the find additional information section. The Security Update Summary page lists all security patches released by Microsoft. 

https://portal.msrc.microsoft.com/en-us/security-guidance/summary

Using KB4483451 as an example we can identify the top-level kb number as 4487078.

https://support.microsoft.com/en-us/help/4483451/description-security-and-quality-rollup-for-net-framework-4-6-to-4-7-2

Additional information about this update

For more information about this update as it relates to Windows 7 Service Pack 1 (SP1) and Windows Server 2008 R2 SP1, see the following article in the Microsoft Knowledge Base:

4487078 Security and Quality Rollup updates for .NET Framework 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, and 4.7.2 for Windows 7 SP1 and Server 2008 R2 SP1 (KB 4487078)