Help Identifying An Air Mail Booklet!

This will probably turn in to a simple question and a simple answer for most of you. Unfortunately, it's not that simple for me and I need some help.
I am trying to find out the difference between two Air Mail booklets I have. In general I know they belong to the C64b or the C64c group. I also know that both feature only Slogan 3. Considering the slogan and the color (pink and red), by way of elimination, I find that I would only be left with booklet C14, C15, C18 and C19. When looking at these two booklets, one appears to be pink and red, and the other one pink, red and white. Somewhere in my analysis must be a mistake, one that's due to my inexperience in these matters. I have attached pictures of the two booklets and hope that someone in this group is able to help. I scanned each of the two pictures with a black background and a white background.
In advance, thank you very much,
hawkstamp.
Pete.

There are a couple of booklet types for this issue. The one with with red on pink is likely BKC18. You'll need to get that one certified.

Here's a certified example of the unexploded booklet, BKC18.




The other booklet might be BKC21, but you'll need to consult the booklets section of the Scott's U.S. Specialized to be certain.

Hi Stampman2002, First, thank you for your response. I believe that the one booklet I have is probably a BKC18. However since the other one is also a $2 booklet,it couldn't be a BKC21 since C21 is a $1 booklet. Could I be reading this incorrectly? Any idea what it may be? Thanks again for the help.
hawkstamp

Red on pink (first one) is either BKC13, 15 or 18 and since you say slogan 3, that eliminates 13. Most likely 15, but you need to check if the panes are untagged (13) or tagged (18).

Red on white (second one) is almost certainly BKC19.