engine wise they are the same, but the Jred has differant covers and the straight handle bar. I think the only direct swap cover would be the clutch cover. The top cover would interchange, but both the top cover and air filter cover would need changed, also the starter cover is taller on the red one requiring the Jred top covers.
You might be able to run the husky starter cover with the Jred top covers, it would just be ugly. lol. You can't go the other way, though.
The fasteners, dawgs, carb, muffler, piston, cylinder, bottom end, crank case, etc are all interchangable.
Now, the 2071 was the counterpart to the 371 and the 2171 was the 372. The main difference being a somewhat transparent fuel tank and side chain adjuster on the 2171.
I have never seen a 2071/2171 with the tall husky air filter. The only filter I have seen on them is the small, low profile rectangular one that is the same as a 365. Some 371/372's had these, but most had the more roundish tall HD filter.
I'll try to get a side by side pic up tomorrow of a 2071 and a 372. They look surprising differant due to the design of the covers.
Ford and lincoln.....same deal here. Same sheep in differant wolves clothes.