Hi,
Both the Part codes are for License feature upgrades in BE6K Solution. (Upgrade existing UCL licenses to a more advanced entitlement or to CUWL)
If the existing setup is having UCL Enhanced license with out Voicemail license, then to upgrade those Enhanced licenses, use the first SKU...
BE6K-UWL-CM2BE --> Upgrade existing Enhanced license on BE6000 without Voicemail to CUWL Standard
If the existing setup is having UCL Enhanced license with Voicemail license, then to upgrade those Enhanced licenses to CUWL, use the second SKU...
BE6K-UWL-CMAPPS2BE --> Upgrade Enhanced license on BE6000 with Voicemail to CUWL Standard
Hope it clarifies your query...
Regards,
Ahamed Adnan