Not 100% sure about the following WRT FAA tickets issued on the basis of a foreign license, but:
The old style does not have the ICAO language proficiency requirement on it. From sometime next year on, you will be required to have this, at least when flying internationally. Therefore, it is advisable to get a new style (credit card size, plastic) now. Good deal at USD 2.- and it fits in a wallet (try that with the idiotic wad of paper the CAA dish out........).