The probability for the experiment of rolling two different colored dice is $$p:=\frac{162601421574468954588}{2^{2\times36}}\approx0.0344322.$$
Here it is assumed that the random sets $A$ and $B$ are selected independently and uniformly at random (from the power set of the set $\{1,\dots,6\}\times\{1,\dots,6\}$). So, $p$ is the probability that the random sets $A$ and $B$ are independent. That is, $p$ is the probability that $\dfrac{|A|}{36}\dfrac {|B|}{36}=\dfrac{|A\cap B|}{36}$, where $|\cdot|$ denotes the cardinality.
Indeed, for the set $[36]_0:=\{0,\dots,36\}$, let $T$ denote the set of all triples $(m,n,k)\in[36]_0^3$ such that $\dfrac m{36}\dfrac n{36}=\dfrac k{36}$ or, equivalently, $mn=36k$.
Let $I$ denote the set of all pairs $(a,b)$ of subsets of the set $[36]_0$ such that $a$ and $b$ are independent. Then $(a,b)\in I$ iff $(|a|,|b|,|a\cap b|)\in T$.
For any given $(m,n,k)\in T$, $$N_{m,n,k}:=\big|\{(a,b)\in I\colon (|a|,|b|,|a\cap b|)=(m,n,k)\}\big|=\binom{36}m\binom mk \binom{36-m}{n-k}.$$
So, the probability for the experiment of rolling two different colored dice is $$\frac1{2^{2\times36}}\sum_{(m,n,k)\in T}N_{m,n,k} =\frac{162601421574468954588}{2^{2\times36}}.$$
Here are details of the calculations, with Mathematica:
