Compatible? Should be. Identical? No (at least not always). Only identical FRU are interchangeable.
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On my m920q I used a random RAM stick and works fine. I would have returned it if it worked only with specific RAM sticks, even Apple didn't do that
Both are CL 19 do you should be fine.
Depends on if they're the same speed. Faster memory has shorter clock cycles.
It doesn't really matter too much though. The system should just run all the memory at the slowest speed/timings.
You should not have any issues. Worst case scenario is that one is slower than the other and will cause the faster one to step down, but unless one is significantly slower, you should have no issues.
Generally, in the past 10 years at least, mixed memory on dual channel configuration has not been an issue.
As long as it fits into the slot, it should work.
That's not strictly true. A board and CPU may not support all speeds, or mixed ranks. ECC and registered RAM would also fit but not necessarily work. There's also low-power RAM that may not be compatible. Just because it fits, it doesn't mean it'll work.
In OP's case, it's likely to be supported because it's probably not ECC, registered, and consumer boards usually support the most common speeds. I don't know how compatibility on low-power RAM goes.