Using Different Footstep Sounds

Hello

Can anyone tell me what the simplest way of implementing different footstep sounds would be for inside/outside. I see there are many different footstep profiles for snow, water etc. Basically I would just like to have one sharp echoey sound for inside (DIF structures) and another flatter grassy sound for outside (on the terrain).

Is there an easy way to implement this?

Any advice would be most appreciated