Yes. The two units use slightly different hardware and different firmware.
You are IN the discussion thread for the second gen v2.x single bay My Cloud.
For the 4.05.00-315 firmware discussion for the first gen v3.x/v4.x one can see the following thread:
http://wdstagingsplit.staged-by-discourse.com/t/firmware-4-05-00-315-discussion/202234/
http://wdstagingsplit.staged-by-discourse.com/t/my-cloud-model-reference/203498
