Same Manufacturer and ASIO works for me.
I have one PC that has 3 Echo Cards - A Layla 24, a Layla 3G and a Gina 24 and they're all available as ins or outs.
I have an other PC which has 2 Echo cards, a Gina 3G and a Gina 24 and both are available on that one also.
Maybe the drivers are close enough to be seen as same device but they're listed specifically by name and differently in Sonar.