If I understand correctly WS-118#WS-18 and WS-20=SF-A/B ??
it's all a guess game at this point, but WS-18 is definitely the domestic version of D-30.
WS-118 was the one based on WS-10A core. I guess now, it's called WS-20.
SF-A is something new. I guess they are saying it's based on WS-15 core.