The lofts are very similar, within 1/2 degree except the PW which is a degree weaker and the GW witch is 1.5 degrees weaker in the IM. Basically the sole width is slightly wider on the IM’s, the offset is very slightly less and the polymer is injected in all the irons in the IM’s, not just the 3-9 like in the TS1’s. The face material is different as well. I think yo could blend them any way you want. I really like the look of the long irons in the IM, so that might be one area to consider, IM 3-5, TS1 6-PW. Really could do it anyway you wanted since the lofts are so similar. Playability is very similar.