Can you explain where they will be located? Will both door styles be side by side in your kitchen? I can see using both if one is for a kitchen and one is for a wall of display/storage nearby because the display/storage unit would be considered more of an accent. If you are combining both colours of doors in your kitchen, then no I wouldn't recommend that.

The Thermofoil one piece white shakers are on the wall cabinets and drawers with the grey 5 piece painted being located on the kitchen island

Oh dear. What are your options? Are you able to make a change at this point or are you locked in?

I think it's ok to have a different, but closely related, style on the island. The color is already different, so probably nobody would notice. I did that recently.