With the current data collection I can check for a few ATK values:
alive: 208/6-8 (6 data points - 7, 8, 6, 8, 6, 6)
dead: 208/6-8 (19 data points - 6, 6, 7, 7, 6, 6, 7, 6, 7, 8, 7, 6, 8, 6, 6, 8, 6, 8, 8)
alive: 277/8-10 (10 data points - 9, 9, 9, 10, 10, 9, 8, 10, 10, 9)
dead: 277/8-10 (12 data points - 8, 9, 10, 10, 10, 8, 10, 10, 10, 10, 8, 10)
alive: 417/13-15 (7 data points - 14, 14, 13, 13, 13, 15)
dead: 417/13-15 (9 data points - 15, 15, 13, 13, 13, 13, 15, 13, 15)
alive: 611/19-21 (6 data points - 20, 19, 19, 21, 19, 21)
dead: 611/19-21 (8 data points - 21, 19, 21, 20, 21, 19, 21, 19)
=> tile damage from dead and alive heroes (no buffs/debuffs considered) is the same
edit: removed one incorrect data points from the 208 (dead) damage numbers