mixing release system and stable packages

Yes, that's usually no problem. The ABI stays the same from x-RELEASE to x-STABLE. That's what "stable" means, actually.
 
That's the whole point of a STABLE ABI, any binary compiled on RELEASE/STABLE N.x is guaranteed to work on RELEASE/STABLE N.y without recompilation, verson y can be earlier or later than version x.
 
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