Coincidentally I've just bought a packet of both patterns in sz18 from Phil at FTB in order to try both for the CDC midge I'm tying for the Small Flies Swap.
(apologies for fuzzy photo, obviously beyond the range of my compact's macro)
Comparing the two the Tiemcos (on the left) are straight-eyed, slightly smaller and a more goldy-bronze colour. The Dohikus are a blacker nickel colour, slightly down-eyed and a more curved in point. The points on the Tiemcos look amazing.
I think I favour the Dohikus for the midge pattern. I hope my eyesight is up to the challenge!
SharkeyP