Adding pool members but setting different priority group value

Hi Guys,

I want to add additional 2 member nodes to an existing pool with 2 members. The priority group is not set for the existing members. I need to change this priority value for the existing to 20 and the new members to 10 as the new members will eventually replace the old members but just want the new members added already though they should be on an "inactive state" or doesn't participate on the lb round robin method. Will this change cause any downtime for connections on the existing members?

Thanks, Edward