Choosing function over another function Clojure

I have set of function like these,

(defn nmf-kernel [a b])
(defn lin-kernel [a b])
(defn log-kernel [a b])

Then another set of initialization function like these,

(defn fill-random 
  ([a b] "filling matrix random")
  ([a b c] "filling matrix random with another setting parameter"))

Ok, and i have a scenario :

(defn scenario 
   [kernel a b c d e f g]
   (let [init-fn (if (= eval-kernel nmf-kernel)
                     (fill-random a b)
                     (fill-random a b c))))

Question : how can i choose a function over another function idiomatically ? because when i'm using (if (= eval-kernel nmf-kernel)) it feels this method is not elegant. And, how can i design this scenario, when i have 10 kernel function and 10 ways to filling the matrix ?

PS : i have same problem in kernel function creation, but maybe the answer for the kernel function is using protocol in Clojure.