Yes, a good example of disk flowers (or disk florets).
But I wouldn't enter it as an example without showing the entire flower head (including ray flowers). This is already a difficult concept to grasp.
Ray flowers (or ray florets) are not botanically comparable to tepals, and so could never be substituted, one for another, even in different flowers.
---- "Tepal" is a term used to encompass both petals and sepals, when the flower does not have a strong differentiation between the calyx and the corolla.
---- The term "ray flower" designates a type of individual flower that would include all parts that might be present: sepals, petals, ovaries, stamens, etc. Tepals, if they were present, would only be part of the ray flower.
In the case of Tithonia, there are no tepals, because the colorful part that most people would call an individual petal is actually the corolla (not a single petal or sepal) of one ray flower. Thus, the photo above shows 13 ray flowers (and about 90 disk flowers).
Nature creates huge variations in parts of flowers (indeed all parts of a plant). For instance, depending on the plant, a sepal can look like a petal, a leaf, a bristle, a nub, a cone, or be absent entirely. Most plants in the world do not have ray flowers. So while there can be similarities within groups of plants, each will be different.