Thanks for all the responses. I’m currently letting the new speakers play to burn in a bit before doing back to back or any critical listening.
The speakers are Monitor Audio Silver 100 (old) and Dynaudio Evoke 20 (new)
both similar sized bookshelf speakers so placement isn’t an issue, just swap one for the other on the stands.
First impressions are that the dyns have less treble and at least as much or more bass. Will see how it goes when I can critically compare them.