You seem to be very interested in succulent identification; are you familiar with the Cactus & Succulent Society of America?
There are over 80 affiliated chapters of the CSSA, many of them in other countries. There was a list of publications available; at least some of them must be identification guides.
The common names like "hen and chicks" or "Mexican rose" may be applied to several varieties of succulent; however, those varieties may have different scientific names. Someone else's "hen and chicks" may not be the same as mine.
Even Sunset is careful to draw the distinction between:
--Hen and chickens. See SEMPERVIVUM tectorum.
--Hen and chicks. See ECHEVERIA.
And there are hundreds of varieties of succulents, some specific to one locale.
Also: please do not post multiple messages with the same title; it will actually diminish your response, as people will see the titles and think, "Oh, I've already seen that one." If you have any information as to the plants--where you got them, how you got them, who the grower was--that is also helpful. This is a discussion community of (mostly amateur, a few professional) gardeners, and any information you can provide would be helpful.
It's very difficult to open a message and see "Please help me identify this plant," without telling us anything about whether it is indoor/outdoor, how old it is, where in the world (literally) you are growing it, etc. Let us know what you *already know* about the plant(s).
Sunset Zone 17, USDA Zone 9