Mains conditioner vs regenerator

Is anyone able to explain the difference in simple terms between the two? Are both not recommended by Naim?

A conditioner filters, a regenerator reconstructs the mains voltage/current in isolation of the utility mains.

Many modern PV battery systems use an inverter regenerator in parallel with the utility mains. On my setup I hear no difference on my Naim between on the regenerator and when on the utility supply… I thought I might.
I use a TT earth system for both which likely helps.

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