Trainz 2010 compatibility with 09?

For example, would 3.5 work in 3.4?

Short answer: No. Long answer: Yes. First, you will have to backdate it from trainz-build 3.5 to trainz-build 3.4. That will result in all sorts of errors appearing that you will have to solve. Then you have to solve all the errors to make it work in 3.4.
 
... and the asset might use function calls in 3.5 that don't exist in 3.4, making repair impossible.
 
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