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What were the similarities and differences between Newcomen's steam engine and James Watt's steam engine?

I wanted to do a Venn Diagram for my Social Studies project and want to know the major and minor similarities and differences between Newcomen's steam engine, and James Watt's steam engine.

Your answers are greatly appreciated.

Thank you

Similarities include that these engines were called "atmospheric engines" because the steam was under only slight pressure. The real driving force of these engines was a vacuum created when steam is condensed back into water, or rather the pressure of the atmosphere on top of the cylinder.

The Newcomen steam engine used the force of atmospheric pressure to do the work. Thomas Newcomen's engine pumped steam into a cylinder. The steam was then condensed by cold water which created a vacuum on the inside of the cylinder. The resulting atmospheric pressure operated a piston, creating downward strokes. In Newcomen's engine the intensity of pressure was not limited by the pressure of the steam, unlike what Thomas Savery had patented in 1698.

Most notable was Watt's 1769 patent for a separate condenser connected to a cylinder by a valve. Unlike Newcomen's engine, Watt's design had a condenser that could be cool while the cylinder was hot.

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