Hello Andrew, since you can't find 9.4.3.0.12 is because we have a higher version available - 9.4.3.0.16.
Alternative is that you upgrade your ZD3000's to 9.4.3.0.16 and then pull a new Config back up which you can load into ZD5k running code - 9.4.3.0.16.
Release notes are available for 9.4.3.0.16. Hope it helps.
regards
Ramprakash