Yes you can connect two 160cm cages. You will need to make some sort of bridge over the two bases of commercial cages though.
If you don’t other pets (cats/dogs), then a c&c can also be a good option (Although lids can be added to c&c cages). They are more versatile when it comes to shapes and sizing
Two sows or a neutered boar/one sow pair - a cage of 150x60cm is recommended; a 4x2 c&c
Two boars - a cage of 180x60cm is recommended; a 5x2 c&c
Member Gallery: C&C cages/homemade cages
Member Gallery: Commercial Cages
Cage Size Guide