I went to add the Benediction to a self build service. I inserted the service from DS 3 (via Insert Element...Browse...Choose Liturgy...LSB...Liturgies...Divine Service...DS, Setting 3)
When I went to show the text in the Prepare Bulletin section, the DS 1 Benediction appeared. I checked back on the Creating screen and saw that the DS 1 Benediction is the one in that appears in the service preview.