Hi. I've been playing with the Kfactor 90 inch for a couple of years or so now, and it's perfect for me. I need a backup racket for when I break a string, and Tennis Warehouse don't seem to stock them anymore so the BLX 90 is the obvious alternative. Is it the same racket with a different pj? If there are minor differences, what exactly are these? Sorry if this has been asked before. Thanks.