1.3 different engine design improve or worst on bhp

[fv43576]

I am currently owned GLS 2001 1.3 auto with 233,000 miles on the clock, the car is tired torn seat material, rust on the paint work, the MOT need quite a few job to be done, I felt it is better to get another same Yaris what I owned now, I did search on Autotrader and test driver, I have noticed the 1.3 engine T-Sprint design engine is different to my GLS, The GLS have plastic inlet manifold in the front, the later version have CAT exhaust manifold in the front. I was a wonder the one with front CAT would be less power than the GLS? The automatic that I currently have is torque converter are the later model fit with MMT that I wish to avoid.