We all know that Palpatine's disfigured face happened due to his own force lightning attack getting deflected back at him by Windu.
I've wondered for a while now if that happened to Vader when he was zapped to death by Palpatine.
When Vader was unmasked by Luke, we see his face disfigured which, after the prequels, we all assume was what was left after his battle with Kenobi on Mustafar. But there are a few vague similarites between the two faces, like an overall droopiness or the rough areas under Vader's cheek and above the eyebrow that might hint at lightning damage.
Are there any sources that tell us whether there was any additional disfigurement beyond his "pre-existing conditions" due to Palpatine's force lightning?
Canon is preferred but Legends is fine if there's nothing in Canon that supersedes it.