1. Why not test drive both the PZEV and the regular version. If you don't notice the difference then don't worry about it?
2. You will need to check with the state (PA). According to the PA law, vehicles need only meet 50 state or California emissions standards, which the regular focus does (according to Ford's documentation). I believe that the state may have separate requirements overall emissions averages for vehicle sales by a manufacturer which causes Ford to only offer the PZEV version here. So, in short, as long as the vehicle you buy says "50 state emissions" or "California emissions" you should be OK....in my opinion.
Per PA DEP
(
http://www.dep.state.pa.us/dep/deput...s.htm#motorist)
"
If I buy a new vehicle at a dealership outside of Pennsylvania, will I be able to title and register it in Pennsylvania? Only if it is certified by CARB for use in California or for all 50 states. Dealerships in neighboring states may stock CARB certified vehicles even if that state does not have similar requirements. PennDot will not title a model year 2008 or newer vehicle that does not comply, unless it's purchase meets one of the
limited exemptions ."