you could try asking over here? the review by cappuchino mentioned this...
and if i'm not wrong, that 40 Ohms driver is pretty much the one used in the M2s Pro?
Aside from ronion's testamonials in this thread the second review listed here https://www.head-fi.org/showcase/smabat-m0.25277/reviews . By JasonLucas mentions the driver swap in both the text and his video review. The black driver is the 40ohm one which he mentions in the video.
Thanks for sharing the review links. Not too sure if they will use higher price driver for lower price earbuds but overall the review is confusing. Driver Swap may not be possible as no one will buy both earbuds just to test how Driver Swap in different shell works.
Also, I now feel that as these Earbud Manufacturer provide such an expensive earbuds free to many people just to write review, they may not be able to write 100% True review. It is not possible for anyone that he gives honest opinion for something he gets for free. It is like Celebrities endorsing the products they may never use but still say this is great.
In both the reviews, they did not give any honest opinion if one should spend such a big amount to buy these earbuds o not? At few places they say it is good, and few places they say thin sounding. Then say Bass is there, then say it is not not there, clarity is there, but not there.
No comparison with Monk+ or any other earbuds which many people use. It is very difficult to rely on these paid reviews in my opinion. Let's see if I can still take risk of buying M0 40 Ohms.