Aechmea comata var makoyana has already been transferred to the cultivar name of ‘Makoyana’ and for the same reasons we should treat Aechmea caudata var. variegata as Aechmea ‘Forget Me Not’. It is a variegate and has origins in cultivation and is not accepted in The World Checklist of Selected Plant Families.
What I find interesting is that this was treated in synonymy with two different species. I would agree with Foster and link this variegate with A. caudata. From my observations, this sporting to variegation of this variable species seems to have occurred on other occasions over the past 50 years, not only with different variegations but width of leaf.
Aechmea Forget Me Not
Was Aechmea caudata var. variegata