Well, if you weren’t able to tell from my previous post, the engines are of the same family: the GR engine family. Toyota is very logical in naming convention.
So yes, they are very similar in terms of engine family and design.
But, in actual operation, the engines are far different. The 1GR-FE being put into non-US LCs (7x/200), are way different than the 2GR engines being put into the US Tacomas.
There are differences in terms of HP and torque; there are differences in terms of whether the engine is mated to an auto transmission or a manual transmission, there are differences in engine management; there are differences in axle ratios and all sorts of other platform specifications.
Very similar to how Boeing and Airbus build similar vehicles with different power plants: Pratt/CFM/GE/ and how each platform has different ways of making money.