1) For images, you'd have to make sure they were named the same as SdA's database dictates (look in SdA.xml). Or, you could download an updated SdA.xml from this site that has alternate filenames.
2) Yes, yes, yes, as long as you have port forwarding setup with your router/firewall. Or both you and your opponent use Hamachi. LAN is easiest, so this is a clear advantage that both SdA and Lackey have over GCCG (play without internet).