Updated November 11, 2021
No. The vaccines are not interchangeable and both doses must match. Your vaccine card will specify the type of vaccine you received and when you received it.
New guidance from the FDA and the CDC does allow you to receive a booster dose that is different from the initial two doses of vaccine. Any vaccine can be given as the booster dose. For instance, if you received two doses of Moderna vaccine initially, you can get a booster dose with the Pfizer vaccine.