How to keep same armature for all animations

I wants to know how can i create animations with same armature(no. of bones) so that i can use it on my avatar. Because i am facing a issue when uploading model to mixamo for animation, but it is changing my armature bones. Which is deforming the model when applying animation on original model.

Hello,
Mixamo animations are compatible with Ready Player Me avatars. You could also use our animation library, that you can access on GitHub here: GitHub - readyplayerme/animation-library: Ready Player Me Animation Library

What development environment are you using?
If you are using Unity, we also have a blog post on integrating the animation in Unity: Get Started With Ready Player Me's Game-Ready Avatar Animation Library in Unity