Yes there is a difference - the 4880 heads are coated to be ink resisting. Not sure about the head ranking codes either. I believe the later Blazers were based on the 4880.
Yes the Epson part number F187000 is correct for the Epson 4880, the 4800 is part # F160010
The 4880 is a better priced print head!
Dan "HAPPY PRINTING"