Not having driven the Urvan lately, I can't really say by how much the TCI is faster (if it is).

There are other factors at play. The weights of the two vans (the Starex is heavier), the transmissions and gear ratios, drivetrain losses and etcetera.

A car can have more power on paper, but if it's heavier and has higher drivetrain losses, a "weaker" car can actually be faster.