There are bags that were made specifically for the outlet store though. I am sure that the leather is the same, but the design is slightly different. For example, the Soho. Some were made for the boutique and some that went straight to the outlet. Find a knowledgable salesperson to help you find the differences. I have seen them mixed up before.
Otherwise, there are boutique bags that either never sold in the retail stores OR were a retail purchase and returned to the outlet.
Great deals!!!!
Happy hunting!