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As stated above they should be the same capacity otherwise one will charge/dischagre quicker and can cause problems

I fitted an extra battery to my Ducato. A few points.

2  identical batteries of the same age are better.

Having wired the batteries in parellel its better to take the live from one battery and the neutral from the other.

Unless very  short and no chance of shorting the live lead joining both batteries shoud be fused at both ends.

From memory I believe 6mm cable was the correct size, but please resarch this more.

Guys, I'm no expert, so I'm only reporting this: our leisure battery cover is in the attic because the previous owner changed the small leisure battery for a much bigger one so it would last longer on his fishing trips (or so he said). Wires same, we haven't had any problems.