This is the receipt designed and viewed in Kadence.

Notice the light lines between items in the order container, the orange background in the footer,

the size of the social icons, the shadow around the receipt border, the product thumbnails.

This is the send test receipt(same as above) from Kadence, sent to one of my other email addresses.

Notice No light lines between items in the order container(there are boxes instead), No orange background in the footer,

the increased size of the social icons, No shadow around the receipt border.

This is the same receipt sent from WooCommerce to a test order customer.

Notice No light lines between items in the order container(there are boxes instead), No orange background in the footer,

the increased size of the social icons, No shadow around the receipt border, No product thumbnails.