They have sponsorship with them as part of co-operate deal along with Southampton and Watford (Which were in the EPL last season but are in the Champions league now so that allowed them to solidify a spot for Aresenal instead for this season) but just don't have a logo on the jersey.
That's all really is the difference between these partnerships with all these clubs in the EPL.
They also have one with a team in the Brazilian professional football league:
Flamengo CR

Don't know why there weren't much promotion for the special they have going on for today's matches kicking off with their first one only about 36 minutes to go with the Southampton vs Arsenal match-up.

I put in my already for all their partnership teams to win their matches for this weekend:

https://sportsbet.io/sharebetslip/9ed42dc5-d53e-436a-b7dd-8e5f57894c31

You can still put in your bets on this here:
https://sportsbet.io/sports/event/sportsbet-specials/daily-specials/partnership-special/partnership-multi-bet-6014093a1cbd854fbeae58f1