Frostweed - I took a 6 month weeds ID course with my landscape business partner to settle the same issue between us. Both the photos you linked to are the same plant - pink flowers with spots, clasping upper leaves. Ground Ivy has flowers of similar morphology, but they are unambiguously blue, and the leaves are on fairly lengthy petioles. Also, Ground Ivy produces long, very thin runners while Henbit is basically erect.
