Greetings.
I could not find documentation specifying only Cisco switches can be on the other side of the QSFP 10Gb breakout link.
I suspect as long as the other switch supports the 10Gb spec and other specs such as LLDP/DCBX etc, it should connect.
You may have to work through the SFP+ specific compatibilities with the other switch.
The 1387 spec sheet does list a number of compatible breakout cables.
Thanks,
Kirk...