Question1 yes 🙂 ,only the overlapping speeds have 'A' at the end (the 1.0 & 1.1GHzs)
2.No not all can ,it seems that some 1.2Ghz can though,forget the higher ones for 133FSB
3.So far the S370 Celerons stop at 1.4GHz
Celerons from 1.7GHz upwards are P4 based