Question Correct Multipack FW for EG4 LL V2 (ID:6) 51.2V 100ah?

I have 6 Lifepower4 51.2V V1 and 6 LL V2 (ID:6) batteries. The Lifepower4's are on the current 3.40 FW version. FW on the LL's is the "multipack" from about a year ago. The LL's are communicating with the 18Kpv, but the Lifepower4's are not. Tech support suggested updating the LL's to the latest FW version, but what is the latest is unclear. I have an Updater en route. According to the EG4 document, "Interfacing EF4 LL-S with Other EG4 Server Rack Batteries", it recommends the "Multipack Firmware Version" Z02T12. The latest FW available for the LL/S on the EG4 site is Z02T18. However, the site also has a "Multipack Communication" FW download. So, which do I use? Hasn't the "multipack" feature been rolled into the Z series of FW updates and I just go with the latest Z02T18 version? Is the "multipack" version on the website just redundant and unnecessary?

I've already made the 2-pin cable to run between the two racks.