Yes, the first fruit does not look like citrus medica.
John, it is time to try to make some candied peel from the second one.
This is my attempt with my citrus medica cv. Corsican fruits.
I also tried it with mango pieces.
And the result was great, I changed water during cooking 4 times and I added pieces of mango pulp, when I changed water twice (mango pulp is of course much softer than citron peel, so no need to cook it as long as citron) and the result was great - perfect additive for many cakes.