I don't think so.  A Nature Reserve is not the same thing as an SSSI in principle.

In this case the SSRI seems bigger than the "RSPB" Nature Reserve, which might in fact be owned by the Suffolk Wildlife Trust anyway (not the RSPB).

Snape Warren SSSI geojson file available: https://www.planning.data.gov.uk/entity/14500661

RSPB Snape Nature Reserve: https://group.rspb.org.uk/minsmerewex/local-wild-places/snape-marshes-nature-reserve/  

(Wrong name/owner mapped?)



