Only the long-discontinued 93/97 is called a 93. The 97W just means it has walnut wood. The 97 Historically Correct version is manufactured without the buttons on the side of the receiver that allow racking the slide no matter the hammer position. Hammer must be fully down to rack the slide on the historically correct version.
All 3 are nice guns. The 3 best versions of the IAC 97s. Whoops, wait a minute. Forgot the latest iteration of the IAC Trench Gun, now that is the epitome of the IAC 97s. Unfortunately the Trench Gun is not legal for regular SASS CAS, but is legal for SASS WBAS. The 93/97 is out of print for several years but is a great gun. I picked up 2 cheap when Big 5 was closing them out. Unfortunately not legal for SASS CAS or WBAS, but legal for NCOWS.
There is one for sale here on the classifieds. Price is nice considering it is NIB and there will never be any more made.