To call a function from another Move contract, you need the source code of the first package. If it's available locally or on GitHub, you should add it in the Move.toml file as a local dependency. When you published your first package, a Move.lock file was created which contains the package's published address. This address will be used in your other project that depends on this published package. Here's a resource for setting up dependencies: Move Book on Manifest.

Make sure you have set up your local dependencies correctly. Instead of directly using 'use 0x3df...::coll;', you should ensure that the first package is properly integrated. The error you're seeing generally suggests that the module isn't recognized because it's not correctly linked in your dependencies.