Multiple TCGA BAM for same sample

HI there,

I've noticed that some TCGA samples have multiple RNA-Seq BAM files, what would be the difference between the files?
If it's convenient to use one over the other, what criteria should be used to select such file.

Example:
TCGA-STAD RNA-seq
TCGA-BR-8368-01A-11R-2343-13_rnaseq.bam 14.5GB
_1_TCGA-BR-8368-01A-11R-2343-13_rnaseq.bam 14.7GB

Thanks,

Franco