We've been running 93, 105, 205 together in a few of our stores while we prepare to pahes the last of the 93s out of service.
Newer clients (which can use 205 available functions) don't roam well onto the 93, they roam somewhat better onto the 105, but notice that higher speeds aren't available
The legacy clients also seem to like the 205 better, but work fine with 93/105.