If you are using a Kindle App on an iPad or other iOS device, you will not be able to read any Kindle eBooks published by Penguin. However, you can read the ePub format of the Penguin eBook using the OverDrive Media Console and not the Kindle app.
You can easily identify a Penguin eBook for Kindle eReaders in the catalog. It has a description after the Kindle icon which reads: “Kindles and free Kindle apps via USB only“. In the title below, if you have an iPad select EPUB format and download it using the OverDrive Media Console for the iPad which can be downloaded for free from your app store.