This is a bit tricky and really impossible for anyone to answer definitively.
Truth is, any position should/could pay whatever someone is willing to pay for it. There are no solid figures that can be provided. Every person, position, and company is different.
My suggestion would be consulting rates at about two-thirds your full working rate. So, if your full rate is $50/hr then consulting rates would be $35/hr or around that. It's customarilycustomary that consulting fees for some positions are less than actual working rates. However, some individuals only consult, so their rates are just their rates and there's no reduction for consulting.
Ultimately it comes down to what you are comfortable with and what the company is willing to pay. It's always a bit of a guessing game.