I haven't used coconut yogurt (it's bad enough I have coconut milk but I was supposed to try my hand at coco bread) but I would assume it would feel different. There's only one way to find out...
I doubt there is a lot of coconut in coconut yogurt, but I don't know for sure since I don't buy it myself.
I decided to compare labels because my husband chose some coconut yogurt (Skyr brand), so I compared it to my plain yogurt (Siggi brand, which I will eat - it won't be going into soap). Remember nutritional values vary depending on choices of yogurt (low fat, fat-free, etc.) but here is what I found comparing these two:
Both are the same size (150 grams) Both use the full container as a serving size, so the nutritional numbers are for the entire container (s), which is (are) over 5 ounces of yogurt (150 grams).
The plain Siggi yogurt has no fat (no saturated, no unsaturated & no trans fat.
The coconut Skyr yogurt has 3 grams of saturated, 1 gram of unsaturated & 0 trans fat.
The plain Siggi yogurt has 4 grams total of sugars with no ADDED sugars.
The coconut Skyr yogurt has 10 grams total sugars with 7 of those grams as ADDED sugars.
The way I add yogurt to soap is certainly not to add an entire container, but more along the lines of a Tablespoon or two at the most, so there would be NO APPRECIABLE superfat gain if I used the Skyr coconut yogurt.
Others may choose to add a lot more yogurt and may have different results depending on the source of the Coconut yogurt they were to use and it's particular fat content. But unless you make your own yogurt using high fat coconut milk, and use a lot of it, I really do think it is unlikely to make a noticeable difference to the Super Fat.
I listed the sugar content because that is another factor that would affect the soap.
But I probably shouldn't use the blueberry or strawberry ones!
I don't see why not, unless they have bits of seeds. I prefer my flavored yogurt to be seedless and without bits of stuff that will stick in my teeth. But I have used blueberry yogurt in soap in the past when that's all I had on hand (no seeds) and it didn't make a noticeable difference from plain yogurt. But like I said, I don't use a whole lot of it when I do use it in soap.