Random Texture for MatID

Hello. Have: mesh planks with 16 textures diffuse and 16 textures NormalBump. I have created material with parameters (and first textures from array). Created blueprint for example How to create a random texture on spawn in world - UE4 AnswerHub
Got a good result, but don’t get matching textures diffuse with NormalBump. Tell me the solution

All right, understood