As with people, animal personalities are truly diverse. Continue this process an eventually you will have good results. I suggest that you wear a smock or bath robe when playing with the new pet. Remove that item of clothing and wash your hands prior to handling your pig. What were once loving family pigs have turned on their owners upon the adoption of another pet.
Scent is a very strong factor in terms of territory in the animal world.
The smell of an unfamiliar animal on you may be translated as infringement upon your present pet's turf.