Think you will find both bikes are the same colour and the light is making them look different, there was only 2 blues one was a purple base and the other a yellow making the dark and light blues.
Think the dark blue was Sonauto/YMF's own colour, nearest production colour I think is Yamaha 0865 (Dark Purplish Blue Metallic) which was used in 2004/2005/2006 on production sports bikes and in 2010 on the factory race bikes....if i am right ts either the same as or very near too 'yamaha racing blue'.