You have a few options.
You could build out one website and whenever a visitor comes from a specific country you could show that visitor separate pieces of the site, different products, etc... but this is not easily done and is a nightmare to manage.
You can keep the two separate websites and focus on rewriting the content. This is my first option, if it were me. You have two websites that are in separate countries selling products that are the same but with different offers, discounts, currencies, etc... so this makes the most sense to have a clear line of separation. However, it shouldn't be too difficult to hire a freelancer writer to go through one of the websites and rewrite the content. Make it more relevant to that countries users, add in videos, helpful information, etc... you only have to rewrite content for one of the sites, that would make sure they are not full of dupe content. Then, you could down the road hire the same writer to optimize the content for the other website but approach it with different content that is just as relevant and you should have a win-win-win situation.
Does that make sense?