It's the exact same announcement and form used for assembly's.
The major difference between a convention and an assembly is that few flinch with the convention costs. Usually only a couple of selected brothers know the true cost. Because they find convention facility's cheapest point of the year many times I've seen the travel b budget greater than the rental cost. People would be surprised.I did notice that last year the total costs were up but no idea why, it's possible the per publisher charge was added then.
I've heard some brothers say that conventions are the real funding for the org besides #1 charitable planning.