Difference between Mega 2560 R3 and Mega 2560 R3 PLUS


I've been trying to search for information on what the difference is between these 2 boards.

I have 2 of the PLUS boards and while there is still some stock out there, I want to buy more. However, other than name brands, (I usually buy OSEPP), I'm not seeing the PLUS version for a lower price.

Does anyone know for sure what the difference is between the R3 and R3 PLUS versions?

Thanks in advance.

Seems to be an osepp-only thing. See their product page. Osepp is NOT an official arduino product.