Depends if we are talking a bunch of bananas header or the cast iron exhaust manifolds single header pipe.
If its just the pipe, the US 250 one is similar, but it is deisgned for low mount starter.
The header pipe for the X-flow cast iron exhaust header is the same as the US 200 non cross flow, they bolt right in, but the Aussie x-flow is 1.577" taller and the Aussie starter comes out more because its designed around the 157 to 160 teeth flexplate or flywheel.
1971-1972 XY Falcon/ Fairmont 200/250 header is tall deck 9.38" engine, similar as US Falcon/Fairlane Ranchero/Torino 9.469" 250
In the same way
1972-1973 XA Falcon/ Fairmont 200/250 header
1973-1976 XB Falcon/ Fairmont 200/250 header
1976-1993 XC, XD, XE, XF Falcon/ Fairmont 3.3/4.1 header is same.
Id is 1-7/8" if i recall. The Falcon 6 manual lists larger non cross flow diameters as well.