Yes, in theory you should be able to import your CafeCommerce customers, products and orders into PowerStore as they do have similarities. However, we have not done testing to confirm that this would work. You might have to do some tweaking to the export from CafeCommerce in order to get it to import to PowerStore.
Once thing that is different is images, as images in CafeCommerce are stored in different tables, so imported products will not have images and the default image will be used.