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Taking all the adventure bits away are these frames roughly the same.
Weight?
Geometry?
No, not even slightly close
Geometry for 17.5" fortitude race...
Frame size 17.5"
1 Seat Tube 445mm
2 Top Tube (Horizontal) 595mm
3 Headtube 105mm
4 Head Angle 69.5°
5 Seat Angle 74°
6 Chain Stay 435mm
7 BB Drop 65mm
Stem Length 70mm
Fork Length (A-C) 445mm
And for 17.5" Longitude...
FRAME SIZES 17.5"
1 - Horizontal Toptube Length (mm) 611
2 - Seat Angle (°) 72.5
3 - Headtube Length (mm) 135
4 - Head Angle (°) 68
5 - Seat Tube Length (C-T, mm) 445
6 - BB Drop (mm) 70
7 - Chainstay Length (mm) 458
8 - Fork Offset (mm) 50
9 - Trail (mm) 98
10 - Wheelbase Length (mm) 1134
11 - Standover (mm) 792
12 - Stack (mm) 604
13 - Reach (mm) 420
Longitude is much longer & slacker, taller, larger bb drop, has bigger tyre clearances...