The above two links show photos of the history in a mercenary battle where the deathrattle of Abomination 4 dealt 15 damage to both of the Powdered Kegs, who were both at 30 health and took no other damage before then, and managed to trigger both their deathrattles
edit: I’m unable to post imgur links showing the proof unfortunately
edit 2: This is an attempt, links are without the spaces in:
imgur .com/a/GYM6oMT
imgur .com/a/IQF27bw