The difference in amp-hour ratings is insignificant. What matters is any difference in condition or age, becasue a weak battery will draw done those in batter condition.
If they are all wet cells, you can check the specific gravity in each cell of each battery. I would not use any battery that had a cell that gave a markedly lower reading than all of the others. Another technique would be to have each battery load tested and discard any that were significantly lower than the others.
You may even find that your "new" batteries are much better than your existing ones and you will want to discard the existing ones so they don't draw down the newer ones.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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