I think some members of the GRPL equate the two.
God gave the promised land to the Jews but they still had to roam the deserts from Egypt to Israel to reach their promise. God obviously guided them and sustained them through this migration, but the Jews were still required to make the trip.
I think the Israelites were punished with an extra 40 years in the desert because of disobedience and that if they had been obedient, they would have avoide the consequences/punishment for that disobedience.
I think this an excellent example of how everything is not predestined as some members of the GRPL understand it.
First of all, I am going to leap outside of scripture for an illustration. I don't like to do this as a matter of habit, but it doesn't appear to me that scripture is enough proof for you anyway.
God is creator of all. His is also omniscient, omnipotenet, and sovereign (not to mention a host of other divine attributes). God is not constrained by time as we are. Perhaps you could look at God as the greatest artist of all and His creation is one of His greatest works. God can see in this work all that has happened, all that is happening, and all that will happen in a single glance. You must also realize that God is not only observing this work of art, but created the art himself.
The idea of predestination is really moot from God's perspective. The idea of Man changing God's ordained plan is also laughable. The painting has already been painted. God does not "change His mind" or change at all, for that matter.