If you want to have equivalent of 75mg every day, you have to take 525mg depot per week.
That's what science of pharmacology says.
Any form of Tren in the blood would be metabolized at the same rate.
Depot form is released slowly in the blood stream, that is the only difference.
Once it enters the blood, there is no difference in the metabolism of different forms. 'Steady-state' means as much drug is entering the circulation as being metabolized.
Depot form may have lower blood levels initially and higher later on. Overall, it would balance out.
Half life does not indicate for how long the effect would last. It only means that the drug concentration is decreased to half in that much time. It would decrease to 25% after another half life. Duration of effect would be as long as there is an effective concentration of drug in the blood stream. The effectiveness of drug usually lasts 50%-100% longer than the half life.