Is there a render speed differnece between multiple caches or one cache?

[Alexx31]

Hello,
is there a difference whether I'm rendering from one single tyCache or multiple tyCaches?

And in case that a single cache would be faster, which is the best way to combine multiple caches into a single file?
(tyflow using birth flow?)

I did a rough test myself and it seemed to me not a big difference, but I'm not sure how it depends from the scene.

thanks