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I have shot some .45 acp's that have about the same recoil as some 9mm's, but i have shot some with substantially more.
The 40 S&W has more velocity than .45 acp but less kinetic energy due to the 45's mass. Any semi-auto handgun bullet with more kinetic energy produces more pressure on the slide but as someone already said, the recoil springs are likely different as well as the frame and the slide.
The only factor as fare as recoil that remains constant is that the 45 produces more blow back pressure on the slide than the 40 and the rest are variables depending on the gun.
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