I'm looking for if the 10G SFP+ modules like "S+31DLC10D SFP+ module 10G SM 10km 1310nm" are compatibles or interwork with 10GBase-LR SFP+ ?
10Gbase-LR says up to 10km with monomode fiber at 1310nm like the mikrotik module but the SFP+ I have seen explicitly say 10Gbase-LR (mikrotik doesn't) and are at least 3 times more expensive...
Is this correct?
I'm not quite sure what your question is. If you are asking if the S+31DLC10D will do 10KM using 1310nm using single-mode fiber using LC cable connectors? Yes, it will, that is exactly what the specifications say.
Mikrotik can be a lot cheaper then other brands. I still believe them to be good quality. If you wish to use it in different equipment then Mikrotik I would suggest ordering one and testing it for your purpose.
If your question is different, please ask more clearly.