Currently Being ModeratedFeb 8, 2013 6:32 AM (in response to kimbritton)
In the AppStore, sign-in with that common AppleID and before you select the purchases category, press the option key. You should now have the option of downloading Pages again to the second Mac.
Currently Being ModeratedFeb 9, 2013 7:03 AM (in response to kimbritton)
If "another device" was an iPhone or iPad you have to separately purchase the Mac version as it is separate software.
They have somewhat different abilities and different User Interface, just share the same name and file type.