I just read the following today:
“THERE IS A MISHNA IN MEGILLAH THAT SAYS “EIN BAIN ADAR RISHON L’ADAR SHENIE ELE KRIAS MEGILLAH UMATONAS LEVYONIM BILVAD”; THERE IS NO DIFFERENCE BETWEEN THE FIRST ADAR AND THE SECOND ADAR ONLY THAT YOU CAN NOT DO YOUR OBLIGATION OF READING MEGILLAH AND PRESENTS FOR THE POOR.
THE POWER OF PRAYER REMAINS EXACTLY THE SAME; HOWEVER, BY THE FIRST ADAR THE RABBIS DID NOT MAKE AN OBLIGATION TO DRINK.”
So just as the koach hatefilah is so great on Purim, likewise, it has the same koach on Purim Katan.