Does a 95 silverado 1500 transmission fit 94 suburban 1500?

Not likely. While both are GM vehicles and 1500 series, the transmissions used in 1994 and 1995 GM trucks and SUVs varied depending on engine, options, and even slight manufacturing changes. There's no guarantee of compatibility. You'd need to check the specific transmission codes (found on a tag on the transmission itself) for both vehicles to determine if they are actually interchangeable. Even then, there might be other issues with mounting or related components. It's best to consult a parts catalog or a transmission specialist to confirm fitment.