Jupiter and Saturn - what makes these two planets interchangeable?

Jupiter and Saturn - what makes these two planets interchangeable?

Oi Jupiter is so different from Saturn.. Like opposites!

I don't know what interchangable means in this context. not good in English.

But I think Saturn restraining a Jupiter person is a good thing. I'm a Jupiter people and think BIG and want BIG, want it all. But my Saturn sextile to my Mercury says, "come to an end, make a point, be specific, do summarize". For me they work well together.

Even my own Jupiter is in sextile with Saturn. wide orb: 17-9=8.

On the other side I have Singletones at Saturn/Air and Jupiter/Cardinal. Making me oscillate between inferiority complex and arrogance (God-Complex).

I meant that they are so polar opposites that one can't be without the other.