Shots on goal are shots on target, no? That's at least how I interpreted it. If it is 45 shots total then I would change my stance
Shots on target can also be very misleading.
For example, you could have four feeble attempts on goal, real 1mph pea-rollers, that end up safely at the keepers feet in the centre of the goal, and they would count as 4 shots on target.
Or you could produce four amazing moves where the outcome is four stinging shots that all rattle the woodwork and go out for a goal-kick. These would not be counted as shots on target.
They would, however, be counted as total shots/shots.