K-ultra vs DF64 settings

I am looking for advice on where to start. I really like my 1ZPresso K-Ultra but I am finding it too hard to use on a daily basis with light to medium roasts so I just bought a DF64 to automate the process but I’m not sure where to set it. I set my K-Ultra to 6 for light roasts and 8 for dark. For anyone with both - what setting do you use to be equivalent to the K-Ultra?