The naming convention for NetSuite versions and WSDL versions are the same. For example, for 2023.1, there is an accompanying 2023_1 version of the WSDL, as shown in the following WSDL URLs:
https://webservices.netsuite.com/wsdl/v2023_1_0/netsuite.wsdl
https://content.netsuite.com/download/WSDL_v2023_1_0.zip
NetSuite WSDL versioning denotes:
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the major version: v2023_1
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the minor or patch version: _0
Generally speaking, the WSDL version that accompanies a NetSuite release incorporates much of the new functionality offered in the NetSuite upgrade. For example, if new workflows or new records are introduced in a NetSuite upgrade, the accompanying WSDL often includes new operations or records to support the NetSuite enhancements. In some releases, a new WSDL also includes enhancements to the SOAP web services platform itself. These enhancements are independent of NetSuite product enhancements.
Be aware that when your NetSuite account is upgraded, you do not have to upgrade your WSDL to the supporting NetSuite version. For example, you may still use 2021.1 of the WSDL in conjunction with a NetSuite account that has been upgraded to 2023.1. For more information, see Upgrading WSDL Versions.
With each new release of NetSuite (and new WSDL version), you should read the relevant portion of the Sneak Peeks and the Release Notes that come with the release. These documents list all of the new functionality and any schema bug fixes offered in the latest WSDL.