Specs are similar, with the biggest difference being the 1 degree more loft on the KE4 #5 and the face height being a little higher on the KE4. Although it can be different for every player, generally he KE4 would provide a more penetrating ball flight and possibly a little less spin. That would be if we were comparing exactly the same lofts, but we are not in this case. The one degree more loft in the KE TC #5 could, for some players, present a similar trajectory and spin to the M890 #4. The M890 was designed to help with trajectory, with the cg lower and further back. So, you could hit the M890 a little higher, even with the 1 degree stronger loft. The only way to know for sure, for you, if there would be a noticeable difference is to test them both. Both have great sound and feel.