Ok:

The Pershing saw combat with only 2 US Armored Divisions, the 3rd and the 9th. Distribution was made from the 599th Ordinance Battalion at Aachen to the two divisions as follows:
3rd: 1 tank each to D, E, H, and I Companies of the 32nd Armored Reginment and 1 tank each to companies D, E, H, and I of the 33rd Armored Regiment.

9th: 5 tanks to A Company 14th Tank Battalion, 1 tank to A Company, 2 to B Company and 2 to C Company of the 19th Armored Battalion.

3rd Armored crews finished training on the tank on 20 February 1945.
In one training demonstration Mr. "Slim" Price of the Abberdeen Proving Ground demonstrated the accuracy of the Pershing's gun by shooting German helments at 625 yards with single shots. This was part of the crew's gunnery training.

The first loss came on 25 February to 3rd Armored when the Pershing assigned to F Company 33rd Armd. Reg. was knocked out by a Tiger from about 100 yards. The first hit penetrated the turret through the coax MG port and killed both the gunner and loader. The second hit shot off the muzzle brake setting of the 90mm round in the gun and destroying the tube. The third hit glanced off the right side of the turret and knocked off the cuploa hatch which was open. The surviving crew backed away, getting the tank stuck in a pile of building debris, abandoning the tank.
This tank was nicknamed Fireball . This tank was repaired, the 90mm being replaced from one on an M 36 returning to service on 4 March 45.
One tank of the 14th Armored Battalion A Company lost one Pershing when it was struck by heavy artillery fire on 1 March 45. This tank was subsequently repaired and returned to service on 7 March.
Those are the only two losses, well sort of anyway, of Pershings in the ETO. So, one did get knocked out by a Tiger (which was subsequently destroyed in the action by other tanks present) and one by artillery fire. None got knocked out by a Nashorn, nor from the accounts I've read were any Nashorns encountered by Pershings.

See United States Tanks in World War II, George Forty and Pershing, a History of the Medium Tank T20 Series, Richard P. Hunnicutt

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