Let $E$ be a complex Hilbert space, $E\otimes E$ be the Hilbert space tensor product.
I want to find $A,B,C,D\in \mathcal{L}(E)$ such that
$[A\otimes C,B\otimes D]=0$ but neither $[A,B]= 0$ nor $[C,D]=0$.
Note that $[A\otimes C,B\otimes D]=0$ implies that $$AB\otimes CD=BA\otimes DC.$$ By using the following result:
Lemma: Let $A_1, A_2,B_1, B_2\in \mathcal{L}(E)$ be non-zero operators. The following conditions are equivalent:
$A_1\otimes B_1=A_2\otimes B_2$.
There exists $z\in \mathbb{C}^*$ such that $A_1 =zA_2$ and $B_1= z^{-1}B_2$.
By this lemma, we deduce the existence of $z\in \mathbb{C}^*$ such that $AB=zBA$ and $CD=z^{-1}DC$.