How to copy an element's animation?

Question

HTML

Hello, let's get straight to the point. The client asked me to make the same horse on his site as on the site https://zed.run/
I have been trying to get the animation script for this horse for several days, but all to no avail. Each part of this horse is a separate vector image, and a script sets it in motion, in which, in addition to the year I need, there is a bunch of extra (the file with the script weighs about 5 megabytes).
Please advise how to proceed. The animation is complex, so offering to make it yourself is not an option
. UPD: I will add, making a gif is also not an option. The client is not satisfied