PC-50X Game confusion - help please !

[sut]

After discovering these machines cannot yet be emulated due to them being 'Pong on a chip' Systems I decided to purchase one to play through the games.

 

I have the Grandstand model SD 070 , which came with the Supersportic cartridge (Pong variations) and Car Race.

http://www.ebay.co.uk/itm/grandstand-video-sports-centre-with-2-cartridges-/330827538503?_trksid=p2047675.l2557&ssPageName=STRK:MEWNX:IT&nma=true&si=JQTJQvEifQH391QokqFXZZl8QsI%3D&orig_cvip=true&rt=nc

 

Whilst browsing ebay I also picked up this cartridge:

 

http://www.ebay.co.uk/itm/OPL-OPTIM-600-Console-Game-Motorcycle-Racer-765-Magnavox-Tele-Cassetten-System-/281021158108?_trksid=p2047675.l2557&ssPageName=STRK:MEWNX:IT&nma=true&si=JQTJQvEifQH391QokqFXZZl8QsI%3D&orig_cvip=true&rt=nc

 

which links here http://www.old-computers.com/museum/computer.asp?c=750&st=2

 

Thinking the systems were part of the same family ie PC-50x pong on a chip consoles, but the cartridge is bigger than the other 2 and doesn't fit my new console, if cartridge sizes vary between different systems that used the GI chip is it not going to be near impossible to collect all the carts ?

 

PC-50x Info: http://www.videogameconsolelibrary.com/pg70-pc50x.htm#page=reviews

[sut]

After much googling (would have this would have been much clearer on the system descriptions). They can indeed have different size cartridges housing the same chipsets.

 

Therefore making is slightly more complicated to obtain the entire family of games with the correct cartridge size.