As a marketing team, we don't have answers to this question. We know that 1xBit, 1xBet and many other bookmakers' software is produced by the same company BetB2B. In addition to software - different companies use the same service providers, for example for odds.
As a marketing team, shouldn't you know who is actually running your platform in the background? It is indicative that you don't want to disclose this information.
Some providers might deliver the same verification tokens, or there are other reasons. We can't have a confirmed answer to this question.
This has nothing to do with the software you are using. The verification meta tags in the header of your website, which I have highlighted, are not from game providers but from services like google, microsoft, yandex and paysera and are
unique to each user. They are required to verify the ownership of the domain (website) at those services. That's why they are called verification meta tags.
The fact that you cannot (or simply don't want to) explain how the same entity have access to the backend of both websites leads us to the only logical conclusion that both websites belong to the same entity, and that is 1X Corp.
If you have any other explanation, I would like to hear it.