How to change currently existing animation?

[PilatTao]

Guys, i know that is's a very stupid question, and ofc this part of forum is for modders (no advanced users like me) but i dont know another place to ask.
I have a mod, that adding another vimpire feeding animation(i think), like when u sneakes behind can push E and use "Feed from sneaking". It's okey.
My problem that i dont know where to find this script to change animation to another one (already exist).

p.s. im using PSQ (Play Succubus Quest) with another SL mods, but succubus i have another vision of succubus feeding(wanna change it to kiss-like animation (Leito's kissing animation and some others)).
And is there any tips to make this action stealth, all the time animation playing?

p.p.s sry for datbadenglish)