This is quite easy, all you have to do is to move the entire WhatsApp folder from Android to Apple phone. But, before you proceed make sore to activate the WhatsApp on the new Apple phone. Once you have installed and activated the Whatsapp on the new phone, you are ready to transfer the Whatsapp installed folder from android to iPhone.
However, you can use the Android data transfer tool to perform the task but still, a simple copy paste will do the job!!