Connection between Game USA and other games

[Vikograd]

Hi folks,

so I've been looking at lost of PCBs lately and noticed a common theme for some of them.
Game USA multicarts seem to always have three main features:
1. The ID is printed on the PCB with black ink
2. There is always some long string of characters printed directly on the PCB
3. There is always a four digit number using a font that resembles the standard 7-segment display

Now the weird thing is that I've also begun to find those indicators on other cartridges' PCBs that don't have the Game USA label attached to them.

Could this mean they were all made by the same company or am I overthinking this and the latter 2 features are very generic, i.e. not specific to one manufacturer?

Here's some images of Game USA multicart PCBs with the three features mentioned above:

https://www.jensma.de/pirates/?show=bootleg&id=174
https://www.jensma.de/pirates/?show=bootleg&id=276
https://www.jensma.de/pirates/?show=bootleg&id=113
https://www.jensma.de/pirates/?show=bootleg&id=139

And now some of the other, seemingly unrelated carts with the same marks:

https://www.jensma.de/pirates/?show=bootleg&id=1
https://www.jensma.de/pirates/?show=bootleg&id=35
https://www.jensma.de/pirates/?show=bootleg&id=123

I hope anyone here has any idea if they're related or if something similar to this has been known to occur for other brands or systems...

[Ankos]

A company with an unknown name (often called NGCA because they sold English-language releases of Vast Fame games with the text "New Game Color Advance" on the box) sold a massive number of games and also put black stamps on their PCBs, so it's probably them

[Vikograd]

that makes perfect sense.
thanks for letting me know

[Ankos]

You're welcome