Just to answer my own question, the packs are for Orion 11, and are not needed for earlier versions. Only requiring the primary install of the IPAM module, and the 4.1 pack for AWS.
Since Orion NPM 11, IPAM compatibility is now included. This means you no longer have to install the IPAM Poller package on polling engines if NPM 11 is already installed on the poller. By upgrading the poller to NPM 11, the IPAM package is removed. If you try to install the IPAM Poller package after having upgraded to NPM 11, you'll get a notice that the IPAM package is already installed. It would also wrongly state that you have an option to remove it from add remove programs.
IPAM never had a load balancing feature, but the IPAM team is working on something to get that bit working, finally.