I know the LEDWiz doesn't require specific wiring for the colors, I'd doubt Pacled would either.
The reason is that to the controller, a color LED is just 3 individual LEDS, each of which can have variable intensity.
It's up to the software you use to map which output is which color. LEDBlinky does this quite nicely. Once you gang your three color outputs together, the software then displays them as if they were a single unit, even though internally, they're still just 3 individual LEDs.
But as far as specific order goes, no, there's not any requirement for that. To keep your sanity, though, I'd suggest picking an order and sticking with it throughout the wiring.