Yes.
The 78G and Metropolitan have the exact same nib, feed, and section (other than the color of nib and tip size). I believe this applies to the Knight as well, but I can't verify.
The Plumix, Penmanship, and Prera have the same feed and nib (again, aside from tip size & coloring)
And just to gush on the Metropolitan - it snaps closed very securely, but can still be opened one-handed. It's been in my pants pocket for the last week and I'm really enjoying it.
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