Use RBS50 from RBK50 with different RBK50

Apologize if this has been already addressed. I moved my Orbi RBK50 from one home to a smaller residence, the RBR50 by itself has great signal strength and performance throughout so I am not going to use the previously paired RBS50 satellite unit.  Am wondering if this RBS50 can be used in another RBK50 system/different RBR50 router or is it tied to the original RBR50  router?

Thank you in advance!