Hi Karin,
Thanks for getting in touch with us!
There is no built-in option to display two currencies. It might be possible though if you use WooCommerce and an add-on that provides this functionality.
Since I don’t know how the first one would work I cannot give you any reply or options for displaying a comparison. Also, I’m not familiar with Order Ticket Pro and haven’t been able to find any references to that in my searches.
Let me know if I you have any more questions.
Cheers,
Andras