I am trying to make a character who has Aalya's sabers, and a Double Bladed lightsaber :maulsaber: .
Would the Double Bladed saber work with Aalya's animations, or the other way around(Maul animations with Aalya sabers)?

Very simple.

Open Aayla's odf, and look at this part here.
The last line of coding is the necessary line to play Aayla's anim set.

Now open aayla's saber coding to this part The last line is what tells the game to play the .combo file in the same name of Aayla.

Step 1 to convert aayla to using maul's specific saber:
Copy the doublelightsaber msh and tga from CIS folder and place into the folder with aayla. Then change this
GeometryName = "rep_weap_inf_lightsabre"
to this
GeometryName = "cis_weap_inf_doublesabre"

If you want to change the animation to any specific jedi... you'll need 1 more step. Change the ComboAnimationBank = "human_sabre melee" to have whatever combo you want, and
Change AnimationName = "aayla" to
AnimationName = "" the name of the anims you want.