Duke v RC Rake & Trail differences

yowsaboss

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Wikipedia gives the following numbers-

Duke
Rake, Trail- 25°, 100 mm (3.9 in)
Wheelbase- 1,367 mm (53.8 in)

RC 390-
Rake, Trail- 23.5°, 89 mm (3.5 in)
Wheelbase- 1,340 mm (53 in)

I thought both bikes used the same frame, but I'm open to correction. So these dimensional difference are the result of what? Different frame (steering head angle)? Different triples?
I'm asking because I'm considering buying a salvage bike to build up something track only, and assumed I could use a ( much more plentiful) wrecked Duke.
 
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