Yeah, the SE and SE/30 have completely different, incompatible PDS slots.
What these adapters do is replicate the PDS slot from the IIci. Daystar's accelerators were all - '030 and '040 versions alike - made to work natively in that slot, and require an adapter for any other machine.
In theory, your adapter should work with either version of the Daystar accelerators. The only gotcha might be that (as the box indicates) it was made before the '040 accelerators were produced, so compatibility probably wasn't tested and debugged, there may not be ROM support, etc etc etc.