Jagdpanzer IV variants

[sapper740]

Got a question for the Armour nuts in this forum. There are two Jagdpanzer IVs in this pic, one with the original 7.5cm variant of the PAK 40, the other with a longer barrelled gun equipped with a muzzle brake. Is one of these the rare Panzer IV/70 hybrid where German engineers mounted the entire upper armoured hull of the Jagdpanzer onto the unmodified chassis of a Panzer IV? I've read of such a vehicle but haven't as of yet seen a picture of one. Apparently only 278 were built before the end of the war making this one of the rarest German tank destroyers. Derek.