If your iMX6 has MX printed on the case, it is still the same model. Some factories allow us to add our own branding to devices, whilst others have standard logos with no option to modify them. We aim to supply the highest quality hardware at competitive prices, so sometimes we have to choose between a factory that has a good track record (but no branding available), or a factory where we do not know how rigorous their testing is (who are prepared to brand the devices).
In these cases, we prefer to ensure our customers receive the best quality possible. Whilst the visual branding can vary, the quality and chips used are the same.
Example of an MX logo:
Example of our logo: