It depends upon the animation. To switch the animations for things like attacking and going unconscious (Pretty much anything for which there is a montage version), you will need to look into the Character_BP for the creature whose animations you want to switch to the ones with changed sounds. Be sure to use the search function (Simply typing anim or animation should make all the relevant things pop up). Some sounds, such as the sounds made when the creature is hurt or those of its footsteps, aren’t attached to any specific animations. To change those, you will also have to be looking at the creature’s Character_BP. But this time, search for “sound” instead. Well, technically searching isn’t required for either of those cases, but saves you the trouble of having to look for the relevant parts.
Now, for a few animations, such as the idle and moving animations, you will have to change those in the Anim Blueprint of the creature (Make sure that the creature you are modifying has the modified Anim Blueprint selected in its Character_BP). You will have to open the Asset Override Editor once inside the Anim Blueprint (It can be found under “Window”). Once it’s open, simply click on AnimGraph and all the files will appear for you to adjust.
Hope this helps!