Scoring one hundred first class centuries is no doubt a remarkable achievement, but in the 150+ year history of first class cricket, 25 batsmen have managed to achieve this milestone. In the same timeframe, only one batsman has managed to score 100 international hundreds, and the person in 2nd place has 29 fewer international centuries.
You seem to be implying that all first class centuries are rated equally, whereas international hundreds are not. I’m struggling to understand how a First Class hundred scored against Loughborough University, for example, is more impressive than a century against any international team in any format.
Finally – do you really believe that if Tendulkar and Kohli played as many First Class matches as those that have achieved 100 First Class centuries, that they would not have reached that milestone?