No, a 1997 Chevy Tahoe 4x4 transmission is very unlikely to fit a 1994 Chevy Blazer 4x4. While both are full-size SUVs, the transmissions changed significantly between those model years. The bolt patterns, input shaft lengths, output shaft lengths, and even the overall case dimensions likely differ. The transfer case mating surface will also almost certainly be incompatible.
You'd need to find a transmission specifically for a 1994 Chevy Blazer 4x4. Attempting to use the 1997 Tahoe transmission would require extensive and likely impossible modifications.
