-3 or -4 clutch line; Does it matter?

Hey guys,

I just found out that my clutch has a -4 line from the master cylinder back, and I have a shiney new [and expensive] -3 line to replace it with. Does it matter? Will it change the feel of the clutch? Any idea if it will cause a problem if I use -3, or should I go ahead and buy a -4 line?

Thanks for your thoughts,