Mattdog
I was commissioned as a pilot in 1990 after having served 6 years as NCA. My flying pay was kept at the NCA rate until I was re-winged as a pilot when it then went onto the officers' rate with the NCA time fully credited. My oppo who was commissioned in branch had his flying pay put onto the officers' rate on the day he was commisioned, again with full credit for his NCA time. I know of many others who were paid in the same way.
One anomaly of this system was that if I had been chopped as a pilot I would have had an instant increase in flying pay as I would have become commissioned in my old branch!!!