If you have worked on some watches ando if you do have some equipment, just giv it a try. If both watches have the same module than you could probably make one working watch out of the two. If both modules are fine than you could save both watches with a little cleaning and repair.
There are very detailed service manuals out there. I broke both crystals when I pushed them out. I just cleaned the plastic gasket and left it im there, just pushed the new crystal in very carefully. Modules are hard to find, therefore you’ll have to buy a working watch. I would open up the module and check it like it is described in the service manual. Both of my modules worked fine, also the speakers. One spring switch was broken, so I bought a NOS and fixed it. Lots of frustration, bit successful in the end.
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