Whether you should purchase the Cal Scale part or not depends on what you are going to use it for. If you are going to use it on Baldwin AS-616s, go for it. The Cal Scale part will require some dressing with some solder and filing to address some roughness on the top of the castings, judging from the photo you linked. I do not own any of these castings since the Baldwins were gone before the 1980s, which I model. These are diesel parts, not the same as those used on steam.
If you need Cal-Scale parts, go direct to the owner, Bowser, otherwise known as English’s Model Railroad Supply, in Montoursville, PA. They have racks and racks of detail parts, one of my favourite places to visit when I’m in the area.