Samsung stock roms generally animations with a proprietary animation package that uses *.qmg files. It sounds like your rom still has some of the qmg files??
The text from thedesc.txt file in bootanimation.zip file, which has two parts, 48 images each, in CM10.2.1 is
720 720 48
p 1 0 part0
p 0 0 part1
The second part, 'part1' is the part that loops and its 48 images are in a part1 subfolder.
The bootanimation.zip that you posted has 63 images. Why does the description text only have a 20 after the 600 600 if you have 63, not twenty images? I think this is a better bet for desc.txt content:
600 600 63
p 0 part0
For 4.3, you could use your bootanimation.zip file with CM 10.2.1, which is the stable Cyanogenmod rom for Jelly Bean 4.3. If you have an AT&T Galaxy S3, then you can find the rom as device d2att at
flash it with TWRP or CWM recovery.
SGH-I747 (AT&T Galaxy S III, August 2013 build date),
Firmware: CM 10.2.1-d2att, with stock 4.3 modem: I747UCUEMJB.