Is it common that two publications have the same GEO accession code?

There are 3 different platforms

GPL13112    Illumina HiSeq 2000 (Mus musculus)
GPL16417    Illumina MiSeq (Mus musculus)
GPL17021    Illumina HiSeq 2500 (Mus musculus)

and 1800+ samples in the GEO accession you listed so it is reasonable for multiple publications to list the same accession.