Obviously I haven't had a chance to read The Year of the Flood, but I have read Tama Janowitz's They Are Us (available in hardback at Amazon.uk for months already and available for pre-order at this site now) and if these reviews are accurate the similarities are remarkable. What are the chances two writers would invent mutant pig/man creatures in labs of the future? Anyway, They Are Us is great.
Atwood introduced pigs "enhanced" with human DNA in 2003 in "Oryx and Crake," and hers are directly inspired on the real-life genetic experiments mentioned above. Janowitz's 2009 book is titled (purposely ungrammatical) "They IS Us."