|The modem is definitely capable. One difference between the two appears to be that the Pixel only supports 3 carrier aggregation. I would guess that this is due to some difference in the RF front end. |
Possible that there are other differences between Cat 15 and Cat 16 but a quick Google search doesnt give me any answers.
Supports up to CAT 15 (800Mbps DL / 75Mbps UL), 3x DL CA, 4x4 MIMO, 256-QAM DL and 64-QAM UL depending on carrier support
The Snapdragon X16 LTE cellular modem employs sophisticated digital signal processing to pack more bits per transmission with 256-QAM, receives data on four antennas through 4x4 MIMO, and supports for up to 4x Carrier Aggregation — all of which come together to achieve download speeds of up to 1 Gbps.