Thanks martintay, gap.
In my discussion with the doctor, I said pfms may need slight stain and could be placed as temps for a very short period, followed with photos for reference to make changes. After try in the doctor chose to bond centrals with a bright and slightly opacified resin to blend with laterals. Also perhaps to go ahead and place all units. Preps had beautiful color ans trans. To me, it can be almost single central difficulty to match to highest degree in cases like this.