There is one allergen associated with an allergy to pork and that is Sus s 1, this is a serum albumin protein.
There is some evidence of cross reactivity between eating pork and allergic reaction to cat skin. This is known as Pork-Cat Syndrome.
A more recent and commonly known syndrome associated with pork allergy is Alpha-gal syndrome. This is when a person is bitten by a tick.
I have put together some more comprehensive resources at http://www.allergyresources.co.uk/Pork.php
The allergy resources page for pork covers the key allergens, which allergic syndromes are linked to this allergy and other foods which are commonly cross reactive with pork.
There is also regularly updated links to useful websites specifically for pork allergies and the latest research papers on the topic.
If you have multiple allergies and are interested in how they are linked or want to find out more about food allergies outside the usual top 14 then you can follow me on Facebook or Twitter, where I share a food allergy card every day of the week.