All phones on the chart are available in off-white or charcoal.

You CAN'T use similar looking Panasonic KX-T7700-series phones.

You CAN'T use the older KX-T7000 series phones, or the oldest system phones, such as the KX-T30820 and KX-T30830.

You can use Panasonic "proprietary" multi-line system phones, such as the KX-YTD7890.

You can use single-line phones, but they will be more difficult to use, so don't put them in important places.