When i look at the joker.......?

i just can't see heath ledger in there. like as hard as i try, i like put a pic of the joker and a pic of heath next to eachother and they don't look a like at all. and the voice is so different too! like i just can't see him in there. does anyone have the same problem? like yeah i know he was wearing all the makeup but i could see jack Nicholson in his joker. i dunno it just really annoys me! i try hard and just can't see it! anyone else have this problem?