
If you purchased with Software Assurance, chances are you have access to the LTSC products in the VLSC. What is important here is how you purchased LTSB. LTSB is more closely related to Windows Server 2016, where LTSC is more like Windows Server 2019. Unfortunately, the licensing isn't like Windows 10, more like Windows Server. What we can confirm for sure is that moving from LTSB 1607 to LTSC 1809 will require a different license. That being said, new versions of LTSB/C are rolled out upon release, and access to the edition specific licensing is unlocked in the VLSC.

LTSB was renamed LTSC a few years ago, so we can essentially reference them successfully as the same product.
