I'm not aware of the parts change.
The plugging does indeed take place at the intake manifold side of the line.
We've been getting good results by:
Disconnecting the line at the EGR valve and the bracket near the oil fliter, then removing the mass air flow sensor and throttle motor assembly, finally the egr pipe is removed from the intake manifold. We can then clean out the gunk using a drill bit (by hand) without removing the pipe.
Interested in any info on the modified pipe, sounds like this is what we should be doing.