For the purposes of carrying in a vehicle only,
18 Pa. Con. Stat. § 6106(b)(11) recognizes all states' licenses. If you are outside a vehicle, you may open carry without a license unless you are on a public street or public property in a city of the first class (Philly),
18 Pa. Con. Stat. § 6108, or on any public street or public property during a state of emergency,
18 Pa. Con. Stat. § 6107. An individual who has a valid Pennsylvania license to carry firearms or is among the litany of exceptions in
18 Pa. Con. Stat. § 6106(b) (including a
Link Removed's license or, for vehicle carry only, any other state's license) may carry a concealed firearm or open carry (including OC in a vehicle, in Philly, or during a state of emergency.