You seem to be confusing labels with mount points. You can use anything you like as a label. Mount points determine how the partition is used. The sytem partiton, no matter how it is labelled is always mounted as / (called root). If there is a separate home partition defined, it will always be mounted as /home.
Partitions for linux installations other than the running system will appear in the file manager identified by the label that you assigned (if any). For example I have a system on which I run Mageia 3, Mageia 4 and cauldron (the development release). The hard drive (which happens to be /dev/sdb) is partitioned as follows:
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Partition Label
/dev/sdb1 root3
/dev/sdb5 swap
/dev/sdb6 home3
/dev/sdb7 root4
/dev/sdb8 home4
/dev/sdb9 root-dev
/dev/sdb10 home-dev
I have configured Mageia 3 so that when I boot Mageia 3 the partition labelled root3 is mounted as / (root) and home3 as /home. The other partitions are accessible through the file manager by label name, home4 etc. I have configured Mageia 4 and cauldron in an equivalent manner. (All three installations use the same swap partition.)
Different linux distributions are separate operating systems. You cannot "combine" them. You can have several distributions on one computer in a multi-boot set up, but you need to reboot in order to switch from one to another.
The system partition / (root) must be unique to each installation and cannot be used with other installations. It is possible to use the same partition as /home in more than one system, but this can often create compatibility problems, and is usually not advisable.
If all you want to do is share documents, pictures etc among different systems it is probably best to create a separate partition for those, labelled appropriately, which can be mounted in each system as /home/data, for example.
You may find it best to stick with one distribution until you are familiar with the basic concepts of linux systems. Multi-booting different linux systems is not IMHO the best way for newcomers to learn about linux. To "try out and compare" use Live CD or Live DVD versions. Most linux distributions, including Mageia, offer several:
http://www.mageia.org/en/downloads/Jim