Like most MC remote apps, Gizmo is based on Server views. Have you tried creating two different views on the MC Server, one for 16-bit and one for 24-bit?
Here's how:
Set rules for a view's file display in RMB > Customize View > Settings > Included Files > Set rules for file display... > Add New Rule > Bit Depth is xx or you could base it on Filename (path) includes xx. Check the two views on the server to see if they contain only the expected albums.
Confirm that both Audio views are available to the network (presumably Generic DLNA, or other) in Options > Media Network > Add or configure DLNA servers > Customize views...
Then I would expect you can select either view in Gizmo to see only the albums with respective bit depth.