I am not sure if its a difference. I went about a month ago to big lake and it was a 3 day non resident license and i went w/ a guide for 10 bucks. not sure if that answers your question but that was my experience.
The OP was talking about bringing his own boat so I was trying to point out that he would not be eligible for the cheaper 3 day licenses like a couple people have mentoined, as you have to be fishing with a licensed guide or licensed charter skiff to get those cheaper license rates. He would need to get a non-resident salt water trip or season license (with basic fishing) if he is not going with a guide. At least that is the way I am interpreting their license page linked below.
Like everyone else on here is saying, getting a guide the first day is worth every penny. It is a very large area with tons of places to fish. The jetties should be good on live bait that time of year. One thing I learned over there. In many places the water is really clear and the fish are super spooky then here in Texas. If you see fish signs and other boats start your drifts way up wind of where you think the fish are.