Hi

It's possible that you create another eCommerce Express block to achieve it. Just add the items that you want added in those pages just make sure to copy the Product settings in your main store to avoid confusion when the items are added in the cart. The cart uses the Item's name,description,attribute to create a unique id so it's important that you replicate the Products values to another block if you want to link those products.

Hope that helps.

JZ