Also, they look a bit more slimmer... https://www.playstation.com/manual/pdf/SCPH-10350EE.pdf https://www.playstation.com/manual/pdf/SCPH-10281.pdf
The SCPH-10281 does not have those LEDs. I know that, as I own one. I don't know if any of the SCPH-10350 adaptors ever lacked those LEDs. But I have never heard of a SCPH-10350 with no LEDs. The SCPH-10350 does not have the modem daughterboard that plugs into the UART connector. Hence, it is thinner.