There are two plants known as chamomile. One is the more popular German chamomile (Matricaria recutita), while the other is called the Roman, or English, chamomile ((Anthemis nobilis ). Although they belong to different species, they are used to treat similar conditions.
When you purchase seeds of plants or bulbs ,chech their bottanical names since few different plants can have similar or same folklore names .Botanical names of the plant are latin .
Basil names can vary too since they are different hybrids some created by nature and some are humanmade .
Right now i have two different hybrids of basil in my herbal garden ,and they are quet similar to appearance ,despite i have seen hybrid which is actually not with green but with purle leaves .
So in the case of basil as long as they are same specie it is ok ,but as you see in the case of chamomile two different species plants are called chamomile .
Do some research before purchase seeeds and my advice is learn the botanical names of the plants .As well do some research on their magical uses and medicine uses .
I tend to keep the labels of my plants with their botanical names so i can easely can google them and check how to care for them and for what to use them .
As for your question probably different people folowwing different tradition will give you differen answers .I go by what i feel teh best choice for me and i will advice you to do the same .Read few more opinions and decide which method will work out best for you .
I love my herbs and herbal garden .Growing your own herbs empower them pretty much and they are attuned to your energy so their medicine will help your magic and even improve your dishes .I prefer to grow them than just go and pick them from the market or from wild nature .
Happy growing !