My KL has nice fitted rubber mudflaps on the front and crappy plain flat ones on the back. Just wondering if the front ones are standard and if another set would fit up to the shaped body on the rear?

no , been through this before . they did not go to the trouble of nice moulded rear ones like they did on previous models.
i hated mine so much I removed them completely

Well I didn't know that. I remember fitting front and rear mud flaps to the TR and TS Magnas during my apprenticeship. They never fit as well as the Subaru at time.