The SIKTC #39K variant (Werther Dell’Edera SDCC Exclusive Red Spot Foil Variant) does not exist. There are only three of these yellow Dell’Edera variants: a white trade dress (39L), a silver spot foil trade dress (39Q) , and a full foil variant (39M).
Aside from my exhaustive research, this was also confirmed on a SIKTC FB group by several retailers and the retail sales coordinator at Boom! Studios.
Thanks.