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Hello Jeibre,
You can only parallel nearly identical units. So yes, they must be the same size.
For more information about paralleling systems and what is required, please read this documentation:
https://www.victronenergy.com/live/ve.bus:manual_parallel_and_three_phase_systems
PS, I have edited your question, please only ask one question per post to help us keep the community organised. You are welcome to post the other question again separately.
MultiPlus Product page / Quattro Product page
MultiPlus 230V Manual / Quattro 230V Manual
MultiPlus 230V Datasheet / Quattro 230V Datasheet
VE.Bus Error codes / VE.Bus configuration guide
Additional resources still need to be added for this topic
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