They actually don't have the same features (I hint at this in the mod description), and the differences are kind of important!
The Basic Heat Pipe has only a quarter the heat capacity of the vanilla variant. This makes it more suitable for the thermal solar complex, which is only hampered by heat energy buffers, but less suitable for nuclear setups, which can benefit from them in more than one way. It also transfers energy at half the rate, with temperature falling at twice the rate, thereby greatly limiting the effective range.
Also, just like in the original mod, I want the technology to be unlocked very early on, and a cheap heat pipe that doesn't need steel is appropriate for this purpose. It offers a bit of flexibility to the layout of the thermal solar complex, and I feel it just makes sense for it to exist. (They are also a part of the thermal panel recipe.)
But still, I can try and take a look at the mod again in the near future, with your suggestions in mind, and see if there is anything I want to change.