Not quite the same blockwise, here you have the differences comparing Axe2 and AX8:
-Effects not present in AX8: Crossover, Feedback Send/Return, Mixer, Megatap Delay, Multiband Compressor, QuadChorus, Resonator, Tonematch, Vocoder
-Effects with limited instances (1 instead of 2): Amp, Cab, Chorus, Compressor/Dynamics, Flanger, Gate/Expander, Multi Delay, Phaser, Pitch, Reverb, Rotary, Synth, Tremolo/Panner, Wah
-Effects with limited instances (2 instead of 4): Filter, Graphic EQ, Parametric EQ, Volume/Pan
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X/Y switching: in this area AX8 is superior than Mark I/II and closer to XL/XL+ capabilities:
-AX8: Amp, Cab, Chorus, Compressor/Dynamics, Delay, Drive, Filter, Flanger, Gate, Multi Delay, Phaser, Pitch, Rotary, Reverb, Tremolo, Wah.
-Axe-Fx II Mark I/II: Amp, Cab, Chorus, Delay, Drive, Flanger, Phaser, Pitch, Reverb, Wah.
-Axe-Fx II XL/XL+: Amp, Cab, Chorus, Compressor/Dynamics, Delay, Drive, Flanger, GEQ, Gate, Mixer, PEQ, Phaser, Pitch, Rotary, Reverb, Tremolo, Wah.