Duromax 440cc same as GX390 GX340?

What GX390 parts are the same on a Duromax?
DuroMax XP18HPE 440cc Recoil/Electric Start Gas
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About this item
440cc D 4-stroke overhead valve design engine that has E-Z pull recoil start
Shaft is 1 in. In dia and 2-3/4 in. Long, while the end is 3/8 in. Size 24 unf - Drilled and tapped
1.7 gal. Fuel tank which at half load can run over 3 hours on a single tank of fuel
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