Mixing high CRI lights will reduce the CRI. The mixed light is on a direct line between the two in the (ANSI) color range diagram.
It is below the BBL so the tint may look okay but it is not high CRI at all.
Btw high CRI is not a good thing for street lighting. It would be more important to reduce light pollution by reducing the blue spectrum to avoid disturbing people’s day-night-cycle and to attract and kill less insects.
Unfortunately cheap street lights are often cold white LEDs because they deliver more lumen per $$$.