> what is the difference in Streams project?
Differences in encryption algorithms, base protocol, markup language, and some non-trivial theme modification.
> is it possible to switch Zap with Osada, Roadhouse, Streams over the same database with already created channels and content?
Zap, Osada, Redmatrix and Mistpark - yes (at this time). Roadhouse and Streams, no; although cloning should still work.
