I've bought some nepeta cataria (catmint) seeds from ebay and plant them. After three and a half weeks, the plants are about 10cm (4 inches) tall. They smell a lot like catnip, but when I compare their leaves with some photos of catnip found on the internet, they look a lot different. This is my first time growing nepeta cataria, so I don't know if leaves change their shape later in time, or is this some other plant? I'll add a picture of the plants.
Thank you very much for your help!