Using a different prompt for a transfer essay?

Applying to Stanford. The Common App essay prompt for transfers this year is “Please provide a statement that addresses your reasons for transferring and the objectives you hope to achieve.”

However, I feel like I could better work within the constrains of a different prompt that would more adequately reflect my writing skills. I wrote a different essay that answers one of the 18-19 topics ("Discuss an accomplishment, event, or realization that sparked a period of personal growth and a new understanding of yourself or others.)

Would it be totally mistaken to use the different essay? The transfer prompt is dry and while I could do something more interesting with it, it wouldn’t be as relevant or interesting as the other essay.