On the left may be a Dyckia. If I am correct, it is not a succulent but type of bromeliad. IIRC, they die after flowering...but not quite sure. (There are similar plants out there, Manfreda and Mangave. Mangave is an intergeneric hybrid between Agave and Manfreda. Their leaves are mostly wider. Your plant has very narrow leaves, that look stiff - are they? - and sharp teeth that look different than teeth on Mangave, so I think it may be Dyckia...) The flowers are different too.

Plant on right is harder to ID because it is very etiolated. It was not receiving enough light, so it grew thin, tall, with leaves too far apart and more difficult to ID. Shape of leaves would help just a little, but there are few plants with similar leaves, so I do not want to guess. Yo need to grow it in better light (make sure it is acclimatized). Stretching will not revert, so consider beheading. But only if you make sure it can be grown in better light, or it will grow just the same. Read thru THESE THREADS to learn how to do it.

Regardless of proper ID, almost all succulents need very good light - sunlight for at least 6hrs/day (few will grow well in average light), and all need well draining potting mix and container with drainage hole.

The plant on the left is a dyckia, perhaps Dyckia 'Cherry Cola' though there are a lot of hybrids that look quite similar and light levels also very much affect coloration. Though dyckias are bromeliads, they're a xeric type and do often get lumped into succulent territory. They also aren't monocarpic.
The one on the right looks like an unhappy Pachyphytum oviferum. It definitely does need more light.

Thank you both for taking the time to give me this info. It's a big help.