Yes, there are different connection recommendations for VCCL_GXB on Arria® II GX devices versus Arria II GZ devices.
The following statement is made in the Arria II Device Family Pin Connection Guidelines for VCCL_GXB:
"For the best jitter performance, provide each quad its own power source."
This statement refers to Arria II GZ devices only. The Arria II GX devices do not require separate VCCL_GXB pins per quad.