You are correct. Look at them side by side it seems like the bayonet bracket on the one I'm going to look at is on backwards. Is that even possible? See how the release button is to the front on your picture and it's to the rear on this one? Good catch! Something I'm going to have to pay close attention to, thanks.
Update, spoke to my daughters boyfriend and he explained the bayonet bracket is removable and apparently this one was put back reversed that's why the bayonet doesn't have a point and the release button is to the rear. Going forward I will refer to him by his name Paul it's quicker to type.
So my resident go-to expert for all things trapdoor is Paul.