No, There can only be 1 primary MBR partition for OpenBSD, (A6 identifier).. disklabel provides an additional layer of partitioning within the OpenBSD area of the disk.
As ocicat said, not every architecture uses MBR partitioning.. MBR was an IBM/MS idea, it supports 4 primary partitions.. or 3 primary partitions and 1 extended partition.. extended partitions are basically a daisy chained MBR that allows you to have additional partitions.
In your case, you might want to create 2 MBR partitions.. one for OpenBSD, and one for Linux(EXT2).
Also, most people place their first partition at LBA 63.. not LBA 0.. because you'll just trash your MBR.
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