Hi DolphiN Tech
No, I wasn't kidding but now I've had time to reflect upon my comment I can see how it may be misinterpeted. What I should have said was that many Far Eastern multi-disc CD changer manufactures, not necessarily the big names, design their products around a common chassis design. This saves on development costs and the final product is brought to market more quickly than if designed in house. This makes strong commercial sense.
I think I am right in saying that multi-disc magazines come in 6 thru' to 12-disc stacks and no way are they interchangeable. However, I have encountered branded magazines of the same capacity which superficially look different but their overall dimensions are the same and their various cutouts, holes, apertures, disc selection tabs are all in the same places. This leads me to the conclusion that these makes of changer share a common chassis design.
Why, therefore, do some manufacturers market their own magazines? Profit, pure and simple! Buy them in from their suppliers, re-badge them, mark them up. A very common practice. It would harm big names' sales if it was widely known that cheaper, compatible, unbranded(?), magazines were available from alternative sources, possibly from the original chassis designers who would surely have designed a compatible magazine too.
I would never advise anyone to purchase a magazine without first checking its compatibility which, in most cases, only suits changers from the same manufacturer. Not such a surprise really. It's rather like inkjet printers and ink cartridges. Compatible cartridges can often be found ... but not always. This was the point I was trying to make with 'neirlrr'. It's always easiest to go for the obvious option but it's not always the cheapest route.
When I went in search of a 'spare' magazine for my Sony changer, I located a magazine compatibilty chart on the Web (can't find it again) and it listed magazines from alternative suppliers, none of whom were known to me. The Sony magazine was more expensive, though not by much, but it was more commonly available. I eventually bought one through Amazon.
REGARDS Phil