First of all, a color combination trademark is not limited to a specific shape, but a designated color trademark must have a fixed shape:

Secondly, the significance of a color combination trademark lies in the color, while the significance of a designated color combination trademark lies in the combination of graphics and colors;

Thirdly, a color combination trademark with only one color lacks distinctiveness, and a designated color trademark with only one color does not lack distinctiveness. A designated color trademark can be composed of many colors, but if it is composed of too many colors, it may be too complicated to register.

note: when applying for registration, a trademark has a requirement, that is, whether to specify a color and what color is specified. If a trademark specifies a color, it means that only the specified color can be used in future trademark use, and no other colors can be used. If no color is specified, there will be no restrictions on the use of colors in the future. Therefore, it is suggested that trademark applicants generally do not specify colors.

for trademark registration, see the following Baidu map, a product of intellectual property rights.