There are minor differences between Block OE versions for VNX1 (5.32) and VNX2 (5.33) In general, most commands are the same and supported on both platforms, but not all.  This is due to feature differences and enhancements in newer models.  Attached is the CLI guide for Block 5.32 and also 5.33  There will be similar differences in File versions and their support of the api.  I'm not aware of any compatibility lists as such, but changes should be in the release notes.
Where I can find compatibility list of VNX storages for  CLI Block API (VNX-Command-Line-Interface-Reference-for-Block.pdf)? Do VNX2 series (VNX5200, VNX5400, VNX5600, VNX5800, VNX7600, etc) support this API? What about VNX1 series (VNX5100, VNX5300, etc) ?  The same question is about VNX CLI File API (VNX-Command-Line-Interface-Reference-for-File.pdf).
VNX CLI Compatibility list