You made me a bit curious so I listened to a portion of Incident on all six. It appears five of the six have the deeper bass drum sound. that makes me think they all came from Hobbes master. Out of those five, the best to my ears is Incident Night.
Now the Mauro R source is from a different source and does not have the bass sound from the drums. It sounds nice and clean, if the rest of the tape is this good, it's a beauty. It was transferred and edited very little by Hrubesh.