Thanks for reaching out! The mortise lock from the 40-193 is the same exact mortise lock. The reason it will not work is because your door is likely not made for a tear-dropped shaped key lock opening like our 40-193 and 40-194 have.
I am not confident that this will work as a replacement but I recommend taking a look at our 40-198. It is slightly different from your original, so you will need to carefully compare the measurements but it may be worth taking a look.
Use the diagrams below for reference to compare the measurements and confirm if this mortise lock might be a good fit for you.
Alternate image for 40-198
Side view of 40-198
