Yes, the higher percentage of Cadaan blood makes them have a slightly distinctive look. However, one also has to take into account where the slaves were sourced from, and how many different ethnicities were interbred in the plantation societies of the Americas when commenting on differences.
Many large plantation owners preferred to have a diverse mix of slaves as this hindered rebellious tendencies due to a language barrier. For instance, Igbo and Fante are not mutually intelligible. To the trained eye, they do not resemble each other much either. Akan people are generally shorter, darker and have less prominent features. Igbo women were
valued as concubines because they are generally lighter than some West African ethnicities.
Also, in the USA, there is a diversity of phenotypes among Madoows depending on where they originate from, Louisiana Creoles for example have more Cadaan blood and they were obviously valued as concubines. In slave markets, they would be bidding wars for mulatto temptresses. Anglos were however not as obsessed as the Latins when it comes to Mulatto women as exemplified by Brazil and it's love for Bunda.
Fulani people have a similar phenotype to African-Americans, with many even resembling Horn Africans.