For anyone who wants to compare the impedance curves from firmware 10 to 11, I've attached a zip file with Amp block presets of almost every amp model from v10 at their default settings. The only ones missing are some of the FAS custom models. Anyway, just add the contents of the zip file to your Amp block's "Amplifier" folder. From there, it's easy to compare the old impedance curves to the new ones. After you've added the contents to the Amp block's Amplifier folder, go to Axe-Edit and add an Amp and Cab block to the grid. Then, select Channel A in the Amp block and select one of the presets from the block library. This will load the default impedance curve values for the selected amp model from firmware 10. Next, select Channel B and choose the same amp model from the Type selection. This will load the new impedance curve values from firmware 11. Now you're ready to compare. Start playing and use A or B on your keyboard to switch between Channel's A and B.
Note: I noticed that the Level parameter of some of the presets in the zip file aren't at their default values. If they're not set to -12.00 then either double click the Level parameter or set it to -12.00 manually.