The standard Mk6 GTI has the new EA888 engine, often (wrongly*) called the TSI engine to differentiate it from the old engine. The Mk6 Ed35 has the old EA113 engine from the Mk5 with a K04, same as the Ed30/S3/Mk6 R etc
*wrongly as some of the VAG marques e.g. Audi still call the new engine "TFSI", and the Ed35 and R are marketed as having "TSI" engines by VW.