Unfortunately, the (great) DS9 epsiode "Trials and Tribbleations" ruined that - put Worf together in a room with TOS Klingons, and one of the characters is going to say *something*!!! So they had to come up with a canon explanation for it.
No. The glorious thing about that episode is that they didn't come up with an explanation.
But it wasn't glorious because it pretty much said that there WAS a difference rather than just simply not addressing it at all.