no- not at all.
the t3 is the exahust side, for quciker spool
the t4 is the compressor side, for more power potential.
so basically you get the spool time of a t3, with the power output potential of a t4.
a t3/t4 is not a small turbo, but not very big either.
what kinda goals/power numbers ar eyou looking to get out of what motor with what build