Hi sugarfire
The only difference of these two part is package. There is the same for chip itself.
LPC11C24FBD48/301,
Packing: TRAY-Tray, Bakeable, Single
Min. Package Quantity: 250
Min. Order Quantity: 250
LPC11C24FBD48/30EL
Packing: TRAY-Tray, Bakeable, Multiple
Min. Package Quantity: 1250
Min. Order Quantity: 1250
Have a nice day,
Jun Zhang