The Aerobats (150 and 152) do have a 'beefed up' structure over a standard aircraft. Strengthened main spar, tailplane spar and wider chord wing struts are the basic differences.
152 Aerobats (A152/FA152) had the same Lycoming O-235 engine as the standard 152.
150 Aerobats (A150) had the same TCM O-200 engine as the standard 150 apart from the French built FRA150L and M which used the Rolls-Royce Continental O-240, 130hp engine.