While the hub diameter and bolt circle look the same, the '03 rotor diameter is 310mm as opposed to the 919's 296mm. In order to make them work adapters must be made / purchased to space the calipers further out. I have no idea if the offset (dish of the carrier) is the same. It can be done, but will not just bolt on.
I did the F4i fork swap four years ago using an '04 fork from a CBR600F4i and my original wheel. The forks came with the brake rotors and everything bolted right up. Now you've got me wondering about rotor-caliper interface.
No worries as long as you used the rotors that came with the forks -- they're already matched up to the calipers. You would have known of any problems at the first pad change. Now, with the 919 rotors ... that's another kettle of fish.
If it has already been done, it is safe to assume it is possible to do it.
On the other hand, if it has not been done never assume it is impossible to do it.
------- Rob --------