> It makes no sense that a manufacturer would have 3 MCUs on the board all with
> identical code
If you need 3 MCU's and there is enough space in ROM to handle the code for them, then economy of scale means it's cheaper to make them all identically.
There are examples where manufacturers create chips using one die for multiple customers and just tell them to strap pins to ground/5v to select the correct one.
> (especially if one of them is a different MCU to the other 2)
The 8041 is mask rom and the 8741 is otp eprom, so it's likely the 8741 does have a different program. The code in the 8041 is likely an earlier version.
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