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The place to look first is the migration guide of the specific distribution. For Hydro this is this guide.

Your solution to condition 1 is very dirty in my eyes. It would cause much headache in the future.

The second condition is the one that actually occurs often. Just copy-pasting a package can work, but you may have to migrate this package to. So you should fork the package, port it to the new distro and do a pull request.

Solution 2 is also possible. But it would be much easier to contact the maintainer of the old package and ask what they use with the new distro.