AD8620 in CMoy


I was researching the Cmoy design and have decided to jump in, I chose the AD8620 for the chip from Brown Dog (They sell it already mounted on a dip adapter. My question (Newb) is; will the plans on for the portable Cmoy work for the dual channel IC? Should I have bought the 8610 (Single Chan) ? This is complete retrospect as I have already ordered the chip! What are the benefits of using the 8620 vs. the 8610? Thanks for any comments or suggestions.