If a concept doesn't have at least one law similar to the original concept, then the concept won't work as fertilizer. The two concepts will reject each other instead. They will try to maintain their integrity and sovereignty, so they reject the influence of other laws and cause a backlash within the Origin god.
The only way to avoid this backlash is to have the concept be created with Origin essence that contains the same soul imprint as the Origin god and contains at least one similar law. That means another concept created with the same laws by a different Origin god won't work.
But as long as the requirements for sacrifice have been met, the similarity of laws between the concepts will allow the sapling to grow stronger as more concepts are sacrificed to the sapling.
