For version 14.0.0 to 19.5.0 same license key is valid. It means if you are using version 14.0.0, 16.0.0, 18.0.0, 18.5.0 etc., you can upgrade to version 19.5.0 free of cost and your license key will be valid. Please note this license key will not be valid for versions 20.0.0 and higher.
For version 12.0.0 to 13.2.0 same license key is valid. It means if you are using version 12.0.0, 12.5.0, 13.0.0, 13.1.0 etc., you can upgrade to version 13.2.0 free of cost and your license key will be valid. Please note this license key will not be valid for version 14.0.0 and higher.