SpeakOut! was forked from an abandoned plugin speakup.
Since version 1.3.0 there is an item in the dashboard menu to import from speakup to SpeakOut! This is a non destructive import, it doesn’t affect the existing SpeakUp data at all, simply copies it to SpeakOut! If you have any previous petitions in SpeakOut! they will not be affected. Legacy SpeakUp shortcodes will still work, but the petition ID may need to be updated.
After importing it is strongly recommended that speakup be deactivated.