On your ignition switch, red/yellow is power out to the headlight on/off switch in your new right switch assembly. Connect it to the red/yellow coming out of that switch. The 2 blue/blacks are just plain blues. They power the tail light and I think the instrument illumination bulbs in the "Park" position.
On your new switch, the blue/black would run over to the hi/lo switch in the other handlebar control. It would send headlight power there when you turn the headlight on/off switch on. The blue is also from the headlight on/off switch and should be tapped into a blue running back to the tail light. Usually the blues coming out of the ignition switch have multi-connectors on the ends where you can plug that handlebar switch blue into. Brown would be power into the kill switch from the ignition switch and red/white would be that power out to the coils.