TDA2030A and 2050 audio amplifier power supply

Does Tda 2030A and 2050 chip amps give exactly same power output on Single as well as dual rail suppy ?
2. What should be heatsink sizes (dimensions) for using two of 2030A & 2050 mounted on same heatsink for making stereo amplifier ?
 
They give almost the same power output. The dual rail supply is more stable at low frequencies.
Heatsink size is determined by air flow, configuration of the vanes; horizontal or vertical.
More information is required to accurately determine your exact needs. The data sheet for these obsolete ICs, will give you a good idea.
 

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I assembled a tda2030A Amplifier circuit both in single suppy & dual rail mode & when powered on 24 volts single and dual rail, both are delivering 6 watts max on 4 ohms load and surprisingly tda2050 chip also giving same 6 watts at 4 ohms on 24 volts. Is it correct or I am doing something Wrong ?
 
Tda2050 produces almost the twice power output compared to Tda2030 but that depends on power supply voltage. Another problem is today what you can get is mostly counterfeit ICs, so you can't expect same performance like the original. You better build something around LM3886, TDA7265 etc because these are still ACTIVE (not discontinued yet by the manufacturer).

BTW 24V AC or DC??