Row Level Security comparison between columns

Hi all

I am implementing RLS in my dashboard where there are two tables, one of managers and other customers. 
They do not have a direct relationship/join but there is a relation which is the team they both are on. The managers manage the team and the table contains the column with each users team; m2m relation between team and manager, each manager can have multiple teams and each team can have multiple managers. so I have flattened the data so I have 2 rows for one manager with 2 teams (to make thing easier). The customers also have a team column in their table.

Issues:

1- Managers need to be able to see only customers of their teams

2- Customer team name can have suffix , for example Sales in manager is equivalent in Sales U and Sales GP in customer.

I can't seem to make this work. I tried simple Customer[team] = Manager[team], it didnt work. Neither did using IN and Search functions.

Any help is much appreciated. 
Thanks