Its roughly the same:
Create a second partition
Install Linux
During install, when you come to partitioning, tell the install to use your existing swap space
Now for the fun part:
If /home is on it's own partition, you can (if you wish) point the new install's /home partition at the existing one - ensure your user has the same name and user id number in both installs
Complete installation and opt to either install a new boot loader, or not and then manually edit your existing boot loader.
This Tutorial may be of help, even though it is for Tribooting a computer.
This Search may also be of use.
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