Just tried them out. They are pingy out of the box. And I won’t say they sound a lot deeper, in terms of deepness I would say boba > ink > PME.
The switch gives a halo-like feeling but not as intense. It might be the same as the ethereal panda stem but I cannot verify that.
The housing surface look somewhat similar to the bobas. Boba is a bit softer than the PME. Bobas sound a touch deeper than PME, just a touch, not by a lot.
In terms of the PME and MPE my guess is they are different, as MPE feel a bit smoother than PME. Just how I feel like not scientific at all.