Uhhh I left Type Heaven with EC9009 at work so I can't do a direct comparison (Realforce at home). However off my memory I think Realforce is more neutral tone (grey) while EC9009 is more beige ish tone.
Also EC9009 has a rougher texture while Realforce has a smoother texture. Typing feel is also different.
To be honest I'd probably not mix and match.
If I happen to bring it home I'll take a side by side pic at a later point.