Yep, they are the same company now. Cheap Tickets wasn't allowing the use of discount codes on Disney resorts in the past, but it seems as if they are now allowing them again. The only downside is that they impose a $25 cancellation fee if you need to cancel. And then they blame that on Disney, which I will say is total BS. Disney may be trying a money grab at every angle now a days, but this isn't one of them.
But if there is not a high probability of cancellation you can get a great deal through either of them.