Can we install Natty package into Lucid?

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http://serverfault.com – I'm using Ubuntu Lucid. Due to some reasons, I'm not allowed to upgrade the OS. I need to use the latest version of a software, with version number > 2.5.x. However, when I check the software repo for Ubuntu Lucid, I found that the latest version of that software is 2.2.26. That version does not have the functions that I need. I found that the software repo for Ubuntu Natty provide the same software with version > 2.6.x. I would like to use this version. Can I edit the source.list file and point it to the Natty repo? Is it ok to install Natty packages in Lucid? Thanks. (HowTos)