Here is a snippet I have found:
However, later in the same reference, there is an interesting chapter on individual differences in visuo-spatial WM ability. In it, the authors describe a sample comprising children with learning disabilities where the deficit could be characterised as High Verbal/Low Visuo-Spatial intelligence, and vice-versa. Under some circumstances, the abilities can be dissociated:
From: Cornoldi, C., & Vecchi, T. (2004). Visuo-spatial working memory and individual differences. Psychology Press.