Is it possible to combine Hydrogen with Shopify Themes?

[jaemil]

Hey guys,

I've two question on how to use Hydrogen, would be awesome if someone can answer it.

1. The customer wants a new landing page but with the old theme/shop, is it possible to combine Hydrogen with the old Shopify theme?

2. Let's say im creating a shop for a customer with Hydrogen. Can the customer adjust the store (Not just products but also for e.g.: different headers, texts, menus... just like in the previous version with Shopify themes).

Thank you for your time
Emil