Hey Annonamangolord, if you don't have a real Sweet Tart to compare the scent to, you can stop by my house to break a leaf off and compare to your seedlings. In these cases where you are not sure which one is the true clone, it's best to grow both seedlings together and wait for them to fruit and then ax the one that is not the clone, unless of course the non clone also has great fruit. I have several Sweet Tart seedlings and in my case, both seedlings arising from the seed are both clones.
Simon