You're right. Who knows?
And yes. The Kaitou Kid from DC and Kaitou Kid from MK is different. That's why it doesn't mean that if Kaitou Kid in DC is popular, Kaitou Kid from MK would be popular. But you cannot deny that if Kaitou Kid in DC is becoming popular, it would definitely indirectly affect Kaitou Kid from MK since he was borrowed from there.
Also, we can now see if these two episodes that have just aired - if they would have high ratings. If they don't, it just meant that people in Japan are not supportive enough of this character and future character development would be limited. However, if these two episodes are a hit, then WHY WOULD THE PRODUCERS NOT CONTINUE IT?! If Kaitou Kid is not at all popular... Then why are these two episodes even aired? Or produced? He could just be a special character that appears in DC and people will still support the episode! Everything happens with a reason. You don't see Heiji having his very own special.