I assume yes, however from the look of it, each servo on the SR6 moves at a lesser range compared to the OSR2+, so it might be not? (I’ve not owned an SR6 to tell)
The loudness level also varies according to the type of servo chosen for each DIY unit and the type of content. So far I’ve not seen a scientific comparison between the two.
For anyone who concerns about the noise level, I recommend following the development of the SSR1.