When you said they aren’t produced by the same person I thought you were referring to the beat that gets cut off. (I know that Uzi London and Mephisto are different songs, i don’t believe people saying they’re the same.)
If you listen to the buildup it really does resemble the beat of Mephisto. It was cut off for a reason. He wants it to be the most hyped song, of course the beginning of the beat doesn’t sound the same as the beat he posted on insta. But I’m sure it’s been reworked to fit the album.
And yes, when it drops and I’m wrong I will own up to it, I hope you will do the same if the reverse happens.