These two flowers are the same species, but their colors differ.
Compared to products of the same kind, this item is cheaper.
This virus is the same type as the one that spread before.
Similar incidents are occurring in various places.
同様 means 'similar/in the same way' and is used more broadly for manner or resemblance, whereas 同種 specifically points to belonging to the same category or type.
異種 means 'different kind/species', the direct opposite of 同種 which means 'same kind/species'.
same race and same script
same race and same language
homeopathy
allograft; allogeneic transplant
homogeneous computer network
Compound of 同 (same) and 種 (kind/species). The reading どうしゅ follows standard on'yomi.