Will i be able to continue my RoM savegame if i install AnD?

I am currently playing RoM 2.9, haven`t found anywhere an awnser to this question.

no, you will need to start new one

You can... kinda. Save your game as a worldbuilder save, install AND, then load the worldbuilder save as a custom scenario. You will lose all production progress, culture, etc, as they aren't saved with Scenarios, but all players lose that stuff, so it's basically fair.

we are on 1.72 and RoM is on 2.91