Micro Transition for selection

I'm using a dropdown select in my design. The user makes a selection, and the content below changes. The problem is the content below is very similar and isn't obvious that it has changed. I was thinking of adding in some sort of transition to make it more obvious the content below has changed.

A couple of questions: Is using a transition the best UI pattern? Are there other methods I should be using? If using a transition is the best pattern, I was thinking of using a loading animation for a short time. Is a loading animation the best UI component for this?