If I had the address I would be able to answer your question better, but since you said you had called the builder, this must be new construction. Didn't the builder answer your question? With new construction many times they have several lots to choose from and they have a model home which they are proposing to build. They often show a picture with the word Simulated on it showing that it is the type of hopuse that they are going to buld but it may not be built at all yet or it may be in a partial state of completion.
The price difference may be due to differences in finish work and which lot you pick. ie 2 stall vs three stall garage or finished vs unfinished basement or the quality of carpet, flooring woodwork cabinetry etc that you may choose. With the address I can look it up for you and see what the situation is.