I believe the likelihood ratio, Wald and deviance tests have slightly different power functions. You can always calculate the power via Monte Carlo on a grid of parameter values and then interpolate in between with cubic splines. But there are probably simpler approaches. Somebody somewhere must have tabulated the power functions already.
I was relying on experts here rather than searching. I don't always do well on searching [I often get confused with SAS documentation]. Given that I have no theory to guess at the distribution or effective size of much of what I do I am going to have problems using that. I work with vocational rehabilitation, and if there is any theory for much of it I do not know it. I work with raw data and little else.
But its useful to find out about Proc Power. Never heard of that.