NBU 7.6 license keys on NBU 7.5

Hi, our customer's master server is NBU 7.5.0.6 on Windows Server 2008 R2 Enterprise. They just changed their license from normal licenses to capacity license. they will then get new license keys from Symantec. However, based on my understanding, the license keys they will get is for version 7.6. My question is:

Can license keys for NBU 7.6 used on NBU 7.5? Thanks.