There are a number of minor differences, but at the end of the day they are both similarly sized single vertical cylinder steam engines.
They both are listed as having .75" bores, but the TP has a slightly longer stroke by .125" at .875".
The Stuart has a full crank with two cheeks, while the TP has a cut away crank disk or open crank with only one cheek.
The Stuart has a larger flywheel and the ability to mount pulleys or etc, at both ends of the crankshaft, while with an open crank the TP can only mount at one end.
There are needful differences to the base mounts and bearing blocks as well.
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