Hi,
As you've already got the inserts they will be fine to use. I use closed cell inserts on pretty much all my tyres as they are re-usable so save a bit of money, I've never had a problem with them on any surface to be honest.
As wet grass needs the spikes of the tyres to be as proud of the carcass as possible to bite into the dirt below to get grip I would use the firmer of the pair of inserts on the wet tyres.
Hope this helps.
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