Strictly speaking, the SPACE algorithms are based on those in the H8000 and Eclipse, or based on the technology found in them. I say based, because they are mainly newer versions, or in some cases entirely new. For this reason, there is no direct comparison so I cannot be more specific.
As an example, "Black Hole" dates back to the DSP4000, or maybe before, "Room", "Plate" and "Hall" type reverbs are found in many forms in our rack products, etc, etc.
The converters are the same as the other Eventide Stompboxes – they have lower specifications (and cost) than those in the Eclipse, but our users seem pretty happy with them, judging from their comments.