https://github.com/ezsystems/ezcommerce-shop/blob/3.3/src/Silversolutions/Bundle/EshopBundle/Model/CustomerProfileData/CustomerProfileData.php#L115 - the following line causes an issue when comparing two delivery parties.

As delivery part identification is a string (https://github.com/ezsystems/ezcommerce-shop/blob/3.3/src/Silversolutions/Bundle/EshopBundle/Entities/Messages/Document/PartyPartyIdentification.php#L25) the === operator is the only valid operator that be should during the mentioned comparison.