I'm also impressed by how many watching it live
Well, I didn't know units killed in friendly fire count as your kills too (as well as deaths). Thus, total count (kill+conversion = deaths) will always match. I think this was not the case before DE or I might be wrong.You can self kill with onagers/bbcs aginst clumps of your own units, and conversions count as deaths but not kills.
So if you add up both players kills + conversions you get 20,167, and if you total the deaths you also get 20,167