According to Staufer's "Pennsy Power", page 160, three classes of Kiesel tenders were placed into service during the "1930's modernization". They were:
90-P-75 (9700 gallons, 21 tons)
110-P-75 (11,980 gallons, 18.5 tons)
130-P-75 (13,475 gallons, 22 tons
Here is a Pennsylvania Railroad photo of class 110-P-75:
Interestingly, this photo is almost exactly HO scale!
Here is the unfinished shell of the new "13,000 gallon" Bowser tender:
Given that it is called a 13,000 gallon tender, that would lead one to believe that it is a 130-P-75. I used an HO scale ruler and the tender body is 33 feet long...4 feet longer than the 110-P-75 photo. A check with Pennsy's Form 109-K indicates that the frame length equals that of 130-P-75: 36.5'. When laid on top of the 110-P-75 builders photo, the rivet lines match extremely close, the height of the unit and the length of the coal bin match exactly. The water section is longer than that of 110-P-75. Since both more coal and more water should be on this larger tender, you'd expect the coal bin to extend further, to somewhere in the middle of the added length. It does not. Also, the Bowser kit contains no details...no water scoop, no marker lamps, no handrails (other than the ladder).
Here is the new Bachmann tender:
When laid on top of the 110-P-75, this tender matches it perfectly for length and height, leading me to believe it is a 110-P-75. A check with Pennsy's Form 109-K indicates that the frame length equals that of 110-P-75: 32.5'. However, the coal bin is too short! Also, the rivet lines don't match...the Bachmann has a line of rivets that follows the slope between the coal bin and the water tank...the prototype does not. The lettering is also too widely spaced. The details are great: water scoop, metal wire handrails, marker lamps (no crystals).
Bottom Line: We're not there yet! The new Bowser is an undetailed close match to the 130-P-75. The Bachmann is a detailed 110-P-75 with too short a coal bin.