Based on how many amplifiers ( and not just amplifiers ) I have owned in my lifetime, it is not uncommon to find different components ( capacitors, transformers, etc. ) to be exact, without a model change to the product, from companies such as P.S.Audio. Many companies are constantly looking to better a current design / product, or even trying to make it more cost effective without raising it's msrp. IME
PS Audio Delta 100
I have a PS Audio Delta 100 powering my Magnepan 1.4s. Looking into the construction of the amplifier by displaying Google Images, I find most Delta 100’s have different architecture than mine. I wonder how many versions are there? What was the company trying to accomplish by so many redesigns? The only online image of a Delta 100 that matches mine was found on a South Korean used hi-fi market site.
https://photos.app.goo.gl/SsBZ9sQZgRm7vTrj7
https://photos.app.goo.gl/SsBZ9sQZgRm7vTrj7