Add price twice as a custom field in CTP

I would like to add Price twice (or thrice) as a custom field in CPT.

Example 1:
My directory is about online products of which some products are in US $, some are in Euro, some are in British Pounds.

Example 2:
Sometimes the product comes in different formats (physical vs. digital), with a different price tag attached.

So how to solve this? When adding Price again as a custom field it says that I change the Field Key Name as it has to be unique. I however, cannot change the Field Key Name. How to do this?