I learned the hard way that KTM RC/DUKE 250 and 390 parts are not the same when fixing my RC, there are many small differences like the front wheel axle, engine mounts etc etc are different sizes, won't fit and not cross compatible.
I would suspect that the Husq will have the same problem, they are not the same bike, 250 is generally have smaller and weaker parts.
I agree with Sisco.
Many parts are shared, but many are slightly different.
When looking at the parts diagrams online the differences are often recognizable, or when cross checking part numbers.