Well they're close at best. SXK uses the cheapest o-rings known to mankind, IMHO. And the SXK submarine rba does not use Philips screws like the OG shown in reviews from Todd. Ulton did it right.
The OG BMM38 has silver (plated?) internals, flushnut, + connection, and both battery contacts. This does not.
Yes, it probably works great, and we can't see the internals.