[AllyCat]

Have you tried it out to read it via I2C, my sensor, supplied by a Chinese supplier look identically.
I would just give it a try and see what happens.

Yes, just fit the "SHT30" into either a Transmitter or Receiver board and load the Arduino : File > Sketchbook > Utilities > I2C_scanner  software (and the terminal emulator).  If it returns a valid address then it should be fine (with just slightly lower absolute accuracy than a SHT31).

However, if it really is an "analogue" version, then it might be quite "valuable".  Most Davis weather stations still use an Analogue version (which can fail quite often) and a replacement can be difficult to find and/or expensive!

Cheers,  Alan.