Not the same as the old parts, that's for sure. In an effort to eliminate some of the more basic issues that could be the root cause of 'the hesitation', I replaced as many carburetor rubber pieces as I could. It seems to have had a positive effect and cured (?) the issue. So far, so good.
Here's what I had planned to replace: (sorry my captions are too small to see/read) that irregular shaped gasket is for the float bowl. Inside of that is the gasket for the carburetor slide cap. Inside of that is an o-ring who's purpose escapes me (it wasn't used). Below the irregularly shaped gasket is the carburetor-to-intake o-ring. To the right of that (lower right) is the intake-to-cylinder head o-ring. In the upper right hand corner is the o-ring and washer for the air/fuel mixture screw. I had previously used Permatex Ultra-Blue to help seal the old float bowl gasket. I opted not to replace that gasket because I did not want to install the richer main jet (I wanted to see if the stock jetting would work appropriately). It turns out I will not need to use the richer (#102) main jet, the NX runs just fine with the stock jetting. At some point, I will replace the old float bowl gasket but there obviously isn't any urgent need. The image of the air/fuel mixture screw (below) shows the new parts on the screw, the old parts to the right and a small hook I made out of safety wire (in the middle). The hook was necessary to pull the old o-ring and washer out of the carburetor body.