If your test level is 200 to start though it takes more to get to range than if your test level is 500 to start yes? And people do have different metabolisms the goal is to get in a healthy range it is going to take different people different dosages to do that. If it takes 500mg to get someone to a 600 range and it takes someone else 200mg to get to 1000 which one is on cycle? What matters is your free and total test levels not dosage to achieve them. Also the body reacts differently 200mg might actually do something for a 20 year old with high test levels to start putting them into a super range but for an 80 year old it might not even get them back to normal. People are different
HEY STUPID: taking any amount of exogenous test basically shuts down natural production. It's testosterone "replacement" therapy not testosterone "boosting" therapy. So no, it doesn't matter "where you start at". Here is an example although I imagine there are too many big words here for you:
https://pubmed.ncbi.nlm.nih.gov/2104626/Chronic T administration in physiological to moderately supraphysiological dosages resulted in parallel dose-dependent suppression of LH, FSH, and sperm production. T enanthate (50 mg/week) suppressed LH and FSH levels and sperm counts to 50% of those in placebo-treated men
It also doesn't matter if you have or think you have "different metabolism", when on TRT the dosage essentially dictates the serum test level.
Here are data from the same study above, note several things with your pea-brain:
• Even slightly exceeding the physiological serum test level (achieved with the 100 mg/wk dose) completely shut down sperm production
• Error bars on the serum test levels are super-tight unless you're on a supraphysiological 300 mg/wk dose to get ~triple the natural unimpaired level and even then only varied by about 20% of the mean