The .gab is a “proprietary” format which is able contain a far greater range-types of animation data then the Maya Cache as well as being more efficient at playback… We are not in a position to expound more on our proprietary format on a public forum.
However, we have created an export SDK which may clarify somethings for you…(please contact studio|gpu training and support for more details).
May I ask, what are you looking for in these differences? is there something you are trying to do with a Maya cache that MSP is not supporting? What will this knowledge gain you. Perhaps we can help clarify what you are looking for.
