They’re in the same family but are very different medicinally. Hound’s tongue is another cousin and is more like comfrey in its actions. I talk about it at the end of the Comfrey monograph in the Individual plants section.
Don't use herbs or combine herbs with medications or use them during lactation or pregnancy without talking with your healthcare provider.
I had the same question, and I’m glad to see the answer. Herbalists sell borage here to make tea, and I’ve put it in a blender soup (it’s somewhat prickly raw). The flowers make a beautiful tea as well.