Hi Matthew.
Unfortunately we can’t swap the licenses around due to the way our software works; what we probably can do though is arrange a refund for one plugin and you can then purchase a different one.
If that sounds viable please email us ([email protected], marking your email for the attention of my colleague Leah) and you should probably also copy in your PayPal receipt. She will then be happy to assist and can give you a definitive answer on whether this is possible in your case.
Thanks!