Exactly what it says. The Kingpin hears of a new threat to his crime kingdom and decides to handle it himself, thinking that it'll just be Spider-Man again. To his surprise, it's some dude decked out in superpowered armor covered in strange runes.
Both have their standard equipment.
Scenario 1: Speed equal
Scenario 2: Speed unequal
Doomguy gets his feats from Doom 1, 2, 64, and Doom 2016. It is the exact same character throughout, after all.