To my knowledge none of the states that seceded in 1861 cited either amendment in their ordnances of secession.
Nor did any of those states try to make a court case based on those amendments.
What is really interesting is that none of the confederate officers [or politicians] was charged with Treason.
Why is this?
I posit that it is because the Constitutional definition is as follows:
Art 3, Section. 3.Which, when combined with Art 1, Sec 10, Para 3 —
Treason against the United States, shall consist only in levying War against them, or in adhering to their Enemies, giving them Aid and Comfort. No Person shall be convicted of Treason unless on the Testimony of two Witnesses to the same overt Act, or on Confession in open Court.
The Congress shall have Power to declare the Punishment of Treason, but no Attainder of Treason shall work Corruption of Blood, or Forfeiture except during the Life of the Person attainted.
No State shall, without the Consent of Congress, lay any Duty of Tonnage, keep Troops, or Ships of War in time of Peace, enter into any Agreement or Compact with another State, or with a foreign Power, or engage in War, unless actually invaded, or in such imminent Danger as will not admit of delay.— places the north's aggression as treasonous as well as gives the States legal grounds for saying
we were defending ourselves from invasion.
Moreover, the Federal Government's claim (that the Confederate states could not secede) means that by that logic the aggression against the Confederate states was indeed Treason. (IOW, the federal argument is self-defeating: in order to be legitimate it has to grant the power to secede, which it does not.) — In short, to take up any CW Treason case was to lose. Period.