Remember the Mini came in 12° 14° and 16° models and had a 43.5″ shaft. If you want something like that a custom-fitted M4 fairway might be about right except it will probably offer even more ballspeed and forgiveness.
There are differences however including most notably more adjustability in the form of Titleist’s SureFit CG technology that allows for more specific spin rate and launch angle tuning. The TS3 also features a more traditional pear shape and tends to produce more of a mid-launch as compared to the TS2’s higher launch.
Both new TS fairway models feature similar technologies as the drivers including extremely thin crowns that are 27% thinner for lower and deeper CG locations thinner clubfaces with variable thickness for more ball speed distance and forgiveness on off center hits and better weight distribution for higher MOI and stability.