New Orbi firmware 2.1.2.18 update issues?

I just logged into the Orbi app on my iPad and after poking around noticed this:

RBR = 2.1.2.18

RBS = 2.1.1.16

I haven’t touched anything since unboxing and installing the Orbi & satellite in November, and I didn’t change any settings at that time — just plugged them in.

Do I need to have the same version on both?

Is the something I need to do to update this or will it do it on its own?

Thanks.