MB Quart Components: noticeable difference between different lines

[STIBungy]

I have a set of 6.5" Discus series components in the front doors. I just bought a set of Reference series. Is there enough of a sound quality difference between the 2 lines to justify removing my door panels and replacing them?

[forum]

I dunno, but if there is I want the other ones when you take em out :P