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There is no exact relation between any of the fixation filters in Tobii Studio and the fixation data stream in the EyeX Engine.
The main reason is that Tobii Studio uses an offline filter, i.e. the fixations are calculated after the eye tracker data recording is finished. The EyeX Engine calculates fixations in real-time, which makes it harder to detect fixations in the same robust way as Tobii Studio. Moreover, the EyeX Engine is adapted to consumer-grade eye trackers which might not always provide a stable stream of coordinates. If you’re doing academic research and have access to the complete recording, I would not recommend to use a real-time fixation filter.