These things are clearly the same species as Galaxy's Child.
Tin Man has nothing to do with it nor is there any indication of a relation.
Except that Junior was just a space faring organism and not a space vehicle, Gomtuu was an actual living ship that cared for it's crew and actively needed them. That was the bit that "inspired" that part of the Gekli ships. That is why I used the word "inspired" in this instance.