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Can a 4.3 vortec air conditioner compressor fit on 5.7 engine?

No, a 4.3L Vortec AC compressor will almost certainly not fit a 5.7L engine. While both might be GM engines, the mounting points, pulley sizes, and even the refrigerant lines are likely different. The 5.7L engine is significantly larger, and its accessories are designed to match. Trying to force a fit would be very difficult and likely impossible without significant modifications, which aren't practical or recommended. You need a compressor specifically designed for the 5.7L engine.