The images I received (above) shows a small plate, with the tac number on it fitted either on or in front of the jack block (similar to the rhombus type used earlier in the war but rectangular in shape. It also shows the strange addition of a BK under the vision port on the turret side. I have only seen this once before on the image below.
Although the dappled light and the low res don’t help but the white tac symbol on the superstructure front, with the gothic L beside it seems very obvious now. Previously I had presumed it was part of something on the fender. Both show two fittings attached to the fender between the spare wheels. The crew mounting step may also have been moved a bit rearward to accommodate the third wheel. There also appears to be a small tool box mounted to the glacis plate in the same location as the 6th K Tauchs had it. The turret jerry can box is missing.
Other images from the same source show PzIIIs of the 7th K with the same jerrycan box on the roof as these PzIVs. This image from the group also shows the 17th PzDiv symbol on the rear, next to the PzLehr emblem.