Unfortunately there is no easy solution. The Evo m (bom) heads use the standard SL Head template. by that I mean the UV map of the evo m head has been uv unwrapped to match the legacy SL UV template. The EVO X does not share the same uv map and the evo x has a seperate UV for the ears.
1. Of course with some Photoshop skills you could cap and paste the Evo x or Evo m skins to match, but you will still get some texture stretching and it wont look quite right.
2. You could also use some blender skills to use a evo x texture on a evo m head and bake it fresh and visa vers to achieve the desired result.
But there is no easy solution. it is like saying you have a pair of pants you would also like to use as a shirt. they are simply cut in a different way.
Here is a comparison of the two:
1. Of course with some Photoshop skills you could cap and paste the Evo x or Evo m skins to match, but you will still get some texture stretching and it wont look quite right.
2. You could also use some blender skills to use a evo x texture on a evo m head and bake it fresh and visa vers to achieve the desired result.
But there is no easy solution. it is like saying you have a pair of pants you would also like to use as a shirt. they are simply cut in a different way.
Here is a comparison of the two: