Excellent! That looks like a match for the Bachmann tender for sure. And the closest I've seen yet that could be inspiration for the Flyer tender.
I could easily see the VT-4 being the inspiration for the American Flyer tender, if say, one photograph was used for the model design. The overall proportions are there. Things like the number of stantions on the handrails, and the location of a hatch in the middle of the running board, are a match. The step in the front, along with being set up for coal, could have easily been a fill-in-the-gap assumption if no photos of the front of the tender were available. And being a single body casting, they obviously flattened out the profile along the sides, rather than modeling a fully round tank.