Ignoring whether marrying your batteries is really necessary or not, ANY set of married batteries can be used in ANY mod as long as you’re not exceeding the limits of the batteries.
It doesn’t matter if you’re moving them from a series mod to a parallel mod, or vice-versa, the batteries won’t care. They don’t know what type of mod they’re in or how that mod is wired up.
You can remove any number of batteries from a married set and still use that set. For example, you can take one battery out of a married set from a 3-battery mod like the Reuleaux RX200 and use the remaining two married batteries in a 2-battery mod like the H-Priv.
Just don’t try to add batteries to a married set. They all need to be married from the start.