The Sim-4 is compatable with some, but not all of the accessories for the WG/WS markers. What accessories are you thinking of? The Sim-4 has a lot of accessories on it's own.
A stock Sim-4 is probably closest in comparison to a stock WG-65.
There's lots of information on the Sim-4 on the Ariakon web site (www.ariakon.com
) and there is a plethora of information on the Ariakon forum (forum.ariakon.com). If you have any specific questions or any confusion cleared up we would be glad to help you.