There is no difference in the first and second dose, a person has to just ensure while taking the second dose that the manufacturer and vaccine are the same as he/she taken in the first dose.

Side effect of Covid19 vaccine
There are few temporary side effects of Covid19 vaccines. Below are the reported reactions to the Covid19 vaccines:
- Injection site discomfort, such as pain, swelling, redness, or bruising
- Muscle pain
- Joint pain
- Headache
- Fatigue
- Chills
- Fever
- Lymph node swelling
If you experience any such side effects, please dont take any medicine and contact nearby hospital for prescription.
References