When do you have Mishloach Manos and Kaparos on the same day?

לזכר נשמת ר' יצחק עמרם אליהו בן ר'אברהם אשי זצ"ל                    

יום השנה, יום ב' דראש השנה                                                                

  

The original Minhag of Kaparos is brought down in Rashi  Shabbos 81b.

Before Rosh Hashana they planted seeds in a flower pot, and on Erev Rosh Hashana they put the plant over the head and said Zeh Chalifosi etc. (Magen Avraham 605 : 3)

The Pri Chadash writes that he personally sends Mishloach Manos to poor people on

Erev Rosh Hashana because the Navi says (Nechemya 8: 10 -12) 

 לכו אכלו משמנים ושתו ממתקים ושלחו מנות לאין נכון                       

וילכו כל העם לאכול ולשתות ולשלח מנות                                       

The original Minhag, Kaparos and Mishloach were both done on Erev  Rosh Hashanah.