The pressure/resistance curve for all domestic GM MAP/BARO sensors is the same. The limiting factor will be the mounting of the sensor.
Some are remote/firewall mounted and connected by vacuum hose. Some are bolted to the intake plenum and directly connect via a bushed and sealed nipple, which is probably what is installed on your Blazer, and probably the same on the Tahoe. If the configuration is the same, as many are, the sensor should work.
Are we sure the MAP is bad? Verify the electrical connector integrity.