It also made jagdpanther.
Your first image is not of a Mark IV, it is of a Tiger.
Nope, I’m wrong and you’re right. That is a Panzer Mark IV.
You are correct, that is a later-model Pzkw IV in the first pic.
However, that is *not* a Jagdpanther in your second picture, it is a Jagdpanzer IV.
BTW, if youve never read the details of how Audie Murphy won the Congressional Medal of Honor, you should do so. Fundamentally, he held off a platoon of Jagdpanthers with a .50 BMG from the back of a burning M10. The heavy tanks in this account were Jagdpanthers:
http://www.audiemurphy.com/documents/doc010/PFCAbramski_27Feb45.pdf
I walked that ground in September of 2016.