They are typically the same and also called 6776. Both are made up names and don't necessarily mean the same depending on who's selling it. Typically a t04z compressor (Aka t67) and a 76 p trim turbine. Some used the GTQ turbine. Precision commonly sold the pt 67 with an s cover. 4"in 2.5"'out. The larger compressor cover is also available. I've seen this compressor stuffed in a t04e compressor cover also. Not optimal by any means. The commonly used wheels i mentioned are Garrett wheels although it was probably possible that some were built with the 65 or 68f1 turbines which are a product of turbonetics. It's the best balance of wheels with respect to compressor mass flow and turbine mass flow out there for these cars running 2.5-3:1 pressure ratio. Both flow 75-80lbs/minute. Enough to run high 9's in the quarter mile in a 3500-3600lb car