Depends on your interpretation of the question. Flowerhorn's are hybrids of CA/SA cichlids so could technically be considered CA/SA. Though I will agree that more than likely the OP meant pure strain CA/SA's and that's why he posted the question in this section.
Red Spotted Severums are just line bred Heros efasciatus which are from South America so technically fit in better with the OP's query than Flowerhorns. Many people make the mistake of confusing line bred fish and hybrids.
Red Spotted Severums are line bred and it's fairly apparent since they maintain all the characteristics of their wild counterpart with the exception of color. An individual or several severums exhibited certain rare color characteristics and an aquarist took it upon themselves to breed them to one another to help ensure the expression of the characteristics they desired. Over time a new color morph would be formed a new line but still genetically identical to it's wild counter part except for the expression of traits which in most cases would be recessive. For instance a white horse is a rare color morph when compared to other colors. How ever breeding a white horse or horse that exemplifies the white color trait either dominantly or recessively to another to get a white offspring doesn't create a hybrid, merely a color morph. It's the same for Severums.
Hybrids like Flowerhorns are bred from two or more different species in order to enhance certain body and color characteristics. The resulting offspring being genetically similar but ultimately different from it's parents. It's these severe differences in genetics that leads to many hybrids being infertile. Mules are an example of hybrids in the mammal world, they're are the result of breeding a male donkey and female horse. Two genetically similar animals able to procreate but the resulting offspring is infertile.
At least that's my understanding of the differences between hybrids and line bred animals.