Peak and average power are often pretty different things. A 400hp EV is much faster than a 400 hp ice. Even the Prius prime gets 160hp electric motor. Id expect around 200hp for the electric side on a PHEV LC. Combine with the turbo 4 and it'll pretty easily out run the V6. Unless Toyota detunes it. Which is pretty on brand for Toyota TBH. So that's probably what they'll really do.The power numbers have been published. The TTv6 produces a bit more more torque and horsepower than the turbo 4 hybrid. Performance will very likely be very similar between the 2 engines, but the Lexus is using the TT V6 because it will be more refined and the hybrid battery placement does not allow for the third row of seating.
I do not see them tuning these vehicles such that the Toyota version is quicker than the more expensive Lexus version.