The passes will be on one phone at a time. You can send them to another device that has Apple or Google Pay by forwarding the email containing the ticket link.
Again from Arsenal ...
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Can I forward a Digital Ticket?
You cannot forward a ticket within your Apple Wallet or Google Pay apps but if you have purchased a ticket for a friend of family member, you may forward the email containing the relevant ticket to the match attendee who can add the digital ticket to their Apple or Google wallet from their email. If you have added a digital ticket to your wallet, you must ‘remove pass’ from your smart phone and / or smart watch before forwarding the ticket in order to enable your friend or family member to add the ticket to their digital wallet."