It is absolutely possible to send two separate hits to two different level 1 sites when generating events on your site. To do this, it will be necessary to create two different configurations in Tag Composer (one configuration per level 1 site), then to initialize the two Smarttags in order to generate two distinct hits.
In order to avoid any conflict between the initializations of your two configurations, we recommend that you rename your second configuration ("config2" for example) and rename the second version of your tag ("tag2" for example) by implementing the following:
var tag2 = new ATInternet.Tracker.Tag(config2);
To ensure that your marketing campaigns are correctly reported on these two sites, it will be necessary to uncheck the option "Link campaign data to the site domain" in your two configurations from Tag Composer (advanced settings).