Son tal para cual isn’t an expression you need to use often, but when the right situation comes up, it does the trick.
- Son tal para cual. Two peas in a pod. They’re identical.
- Son como tal para cual. They’re made for each other. They go perfectly together.
- Son tal para cual. They deserve each other. They’re both bad people.
I associate this expression with telenovelas, especially when expressing delight at two villains whose pairing cannot end well.