@trafficache there is no difference.
You have 4 times the wallet-traffic, though.
For the same traffic volume, one fully connected wallet ( with incoming connections allowed, and 80+ concurrent conn. configured) is "better" than 4 client-only wallets (no incoming connections, 20 standard outgoing connections).
But this will not (should not) affect your mining earnings/probability.
Look at the following config options when mining from several computers to a single wallet, in this example allow the hosts with IP addresses x.[4-6];
nxt.allowedBotHosts=127.0.0.1; localhost; 192.168.0.4; 192.168.0.5; 192.168.0.6;
And running a fully connected node affects these;
If you are behind a NAT Router, enable forwarding of port 8123 to the local IP address of the wallet machine.