It's difficult to say, but the TAR painted covers are hard to compare with his tonal magazine illustrations, because they were b&w and the covers were colour. They don't strike me as similar enough to say the painted covers were Baker. The painted covers differ from his line covers because they look generic. His covers had a tension, conflict and beauty sorely lacking in the painted covers.
Another look at that list is also notable to me, in that I am reminded I have practically all the issues, minus the painted and photo covers.