"Do 'whomsoever' and 'whatsoever' have the same meanings like 'whomever' and 'whateve

[twilit1988]

My dear and respecated teachers,
1: "Do 'whomsoever' and 'whatsoever' have the same meanings like 'whomever' and 'whatever'?
2: "Elevate me moderation rank then I'll join your forum." correct?
3: "Can you remember bitter-sweet moments of your life?" correct?

[Soup]

1: "Do 'whomsoever' and 'whatsoever' have the same meaning as 'whomever' and 'whatever'? <Yes, they do.>

2: "Make me a moderator, and then I'll join your forum.

3: "Can you remember (the) bittersweet moments of your life?