Can HPC packs with active TECS be used with HPC packs off TECS in HFSS?

Yes, HPC packs with active TECS can be used with HPC packs off TECS in versions that support the off-TECS licenses or earlier versions. For example, if you have 2 HPC packs off TECS from 2022 and 1 HPC pack with active TECS, you can use all 3 HPC licenses in HFSS version 2022R2 or earlier.