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This is a match up in size alone.

Topographical Man- http://www.marvunapp.com/Appendix/topograp.htm

Topographical man is much bigger than them

Prodigian's hand was said to span a solar system. Gedirath's hand was larger than the Earth, but not that much larger.

But from the bio, Topographical Man's (worst name ever) arm span is light years, which is a much larger scale than either Giant.