I think that these are two pretty different sets of irons sharing the same design language as TM looks to push the weight-cartridge technology.
Chances are the weight, width, offset, loft, CG, MOI, etc are very different between these two. After all, the R11 is to replace the R9 line, not really the TP line of clubs.
Now whether or not TM should introduce new products as often as they do... who cares. It means cheaper sets of R9s for all.