Yes they should be identical and the same age. If you match a new heavy duty one with and older weaker one, it will deplete the older one quickly and you will get poor performance. Least that is what they told me when I was running 2 12 volts in my RV. Now that was in parallel but I would think you needed to match them regardless as to whether they are series or parallel if they are tied together.
On my boat I have one 12 volt for cranking and accessories and one dedicated to the TM(12V) so they don't have to be matched since they are independent of each other.
Ray


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