Open a second account in US with a partner company based on US

[mauvalswimwear]

We have a company based on Peru that operates in Shopify. As part of our expansion, we create a company with the same name in the US as a partner company. We already have the EIN as an LLC. 

Could we use the same domain as our Peruvian Store? I understand we need to create another store, but this will implicate using another domain? Our goal was to keep the URL for business purpose. 

What could be another alternative for us? We can't use the store in Peru because doesn't have the applications needed to work in North America.

Thanks for the support.