The seller of the set has replied the stamps are Edifil CA 11 and 12. So, Time to show why I am quite sure the seller is not correct.
The height of the overprint on CA 11 and 12 is 18 mm. On 11A and 12, it is 20 mm. The cause is a wider spacing of the lines "FRANCO" and "18 JULIO 1936." Note that, if anything, the horizontal lines in the numerals are spaced further apart towards the bottom of the stamp, if at all.
I measured my stamps. The overprints, from the bottom of the "5" or "8" to the top of the "C" in "CANARIAS" isslightly over 18 mm.
So, first my own one céntimo stamp.

The distance between the two lines is, approximately 2 horizontal lines. The line below "18 JULIO 1936" is set approximately three lines lower.

The screenshot from the
ebay listing shows an easy three horizontal lines between the two lines of text. Additionally, it is set lower. The line in the overprint, certainly is not closer to "18 JULIO 1936."
I cannot see how the seller's stamp can be 11 and not 11A.
My own 2 céntimos stamp shows a gap between the tow lines of text that is approximately two horizontal lines high. The printed line is between three and four horizontal lines of the numeral apart.

Now a screenshot of the seller's item. Again, the two lines of text show three lines and morebetween them. The printed line isbetween three and four lines below the date.

Again, I cannot see how the seller's stamp can be CA 12 instead of CA 12A. And there are no two settings that both are 18 mm high.