Look at the drawings and decide, to me it looks like it won't work because the lock bolt head of a 540 will interfere with the main body of a 520 before the pedal axle assembly is fully home https://si.shimano.com/de/pdfs/ev/PD-M520-2235/EV-PD-M520-2235.pdf https://si.shimano.com/de/pdfs/ev/PD-M540-2234/EV-PD-M540-2234.pdf
Thanks, it does seem like it won't work, I hadn't appreciated the bodies were different given both pairs of pedals are at the bottom of my spares box.
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Look at the drawings and decide, to me it looks like it won't work because the lock bolt head of a 540 will interfere with the main body of a 520 before the pedal axle assembly is fully home
https://si.shimano.com/de/pdfs/ev/PD-M520-2235/EV-PD-M520-2235.pdf
https://si.shimano.com/de/pdfs/ev/PD-M540-2234/EV-PD-M540-2234.pdf