As long you have plenty of live rock the clown goby and sleeper banded goby will be ok. Normally what those charts mean is that fish in similar shape and color. I do have both and they have never botched each other.
As far the six line goes its a toss up, some will be wrasse holes, others might be ok.
Check out these wrasse
Tanaka's Pygmy Wrasse (Wetmorella tanakai)
These wrasse are all peaceful and reef safe. All three are the same size as the six line, and just as beautiful.
Hope this helps