That trace is also of Norris second fast lap that he started immediately after going wide in S2. On that second straight there were cars ahead so it may have helped with top speed slightly. Same for the straight from T3 to T4 that also shows a similar difference in top speed.
If there was more power it would show on the start-finish straight as well and there Verstappen and Norris have same top speed.
BTW Norris in his second lap (compromised by his excursion) matched Verstappen until he let off the throttle in S3.