They look the same to me, with the sole difference that the GRO Search reference says that the DOR is Q1 of 2003, while the Certificate says March of 2003. Fortunately, March is in Q1, so one is just slightly more granular than the other.
More importantly... the GRO **Search Results** are just that: search results, **and thus unofficial**.
The GRO **Certificate** is **an official document** , so use that as your source. Always use official documents when possible.