The product info PDF file has been updated and revised in order to clearly highlight the differences between UCSE and UCCE. Simply put, apart from the additional content, UCCE is based on the UCSE v1.00.03 engine, plus everything listed on page 4 of the product info. Note that multiplayer servers will allow UCSE and UCCE clients to connect, but not UCAWA or any previous titles. You can also view the VCF for UCCE.