I think that's because the V70 had three versions, but the XC70 had two. I think people call the XC70 facelift a P3 because it basically looks the same as the third version of the V70.
This site might help you. Put your reg in, click 'Dampers' & take it from there. That should bring up the ones that fit your car & there's a variety of brands.
www.buycarparts.co.uk
The thing that's useful on that site is you can search for the original OE part number if you know it & it brings up the alternatives from other brands like Bilstein etc, but I can't find the active suspension ones for some reason.
I don't think the bhp makes a difference to be honest & so long as the year is after 2007 (Version 2 on Monroe site), they should be fine.
This site below for example, you can search from the year of your car onwards & the shocks look the exact same, so I don't think they changed the setup at all on the facelift shape.
https://www.partsforvolvosonline.com...Path=2_25_1198