Megawatt Bi Polar Transistor Upgrade

Both devices have a fairly low gain. Whether or not the difference will make a difference depends on how the devices are used and the other circuitry associated with them.

If you have the schematic with device part numbers you can use a program like PSpice to run a simulation to determine if the substitute part will work. There used to be free versions available that are fully functional but restricted to smaller circuits and with fewer parts models.