Yes, it works like this:
1. Make a copy of the KINGS directory with all *.avi files(~32 MB) from cd to your HD: C:\...CIV2\KINGS.
2. Rename the HRLDAMI.avi to HRLDAZT.avi and the HRLDAZT.avi to HRLDAMI.avi. (If you want the animated heralds (AMI+AZT) to be both the Aztec one, make a copy of the Aztec and and rename first the HRLDAMI to somthing other (HRLDAMI1.avi[?]) then the copy of HRLDAZT.avi to HRLDAMI.avi)
3. Sorry for my bad english.