It is possible to have two partitions named "/home" mounted at the same time?
well the partitions aer not called "/home" that is simply the mount point. why do you need two /home partitions in the first place though? just use the one, unless you have substantially conflicting software on each one. but in that case, i'd say jsut use a different user or such like.
to mount the ohter partition, just clone the existing /home entry, but change the obviosu issues, mount point, dev entry etc...