Verified answer

There is no difference. Lyrical is a dance style found in recreational dance studios and amateur competitions very strongly based off of ballet and jazz techniques. There is also no set demi plie routine for classical ballet. A teacher could give you a different routine every class, if he or she wanted.

As a side note, if you are trying to learn dance via online videos, it'd be best for you to stop and just sign up for a regular dance class. Trying to learn at home could result in bad techniques that will be difficult to correct in future dance training, or worse, you could seriously injure yourself. Please be wise and careful, and find a dance studio and take classes there!

EDIT: It just occurred to me that you may be referring to contemporary ballet but you mistakenly called it lyrical ballet. A contemporary ballet class will often use a slightly wider second position than classical ballet, and we often work in parallel as well. Other than that, there really isn't much of a difference between the various plie combinations in classical vs. contemporary ballet, at least that I've seen.