Here's my example because I took undergraduate micro classes.
Undergrad microbiology: you learn mostly about bacteria, how they make energy, <20 bacteria to know in detail, go into viruses and focus on HIV and flu, and then end the year with a general talk about prions. You have four months to learn it.
Medical school microbiology: here is every type of bacteria that causes human illness, learn every symptom, what type of media is needed to grow it, what it looks like on X-ray. Then learn every type of fungus and the illnesses they cause, what symptoms look like, etc. Then you cover every family of virus and what they cause, what vectors exist, then every prion we know of and what they cause and every parasite. We should also know what type of test we should run to help determine the cause of infection. Add in learning what type of antibiotic to give for each bacteria, a secondary backup antibiotic in case a person is allergic, what antiviral to use for what or which ones to use if someone has two viral infections, what antifungals to use, what vaccines are available and when they should be given and it becomes even more difficult. We should also know the pathophysiology of all of this. Then make a final that is cumulative to make sure everyone knows the material that we covered in two months.
There's virtually zero overlap other than the name of both courses being microbiology. In medical school, our first two lectures were basically my entire undergrad course speed up to be covered in 3 hours and 20 minutes.