Is it permissible to fast on Tuesday instead of Monday in the month of Rajab to obtain the same reward, due to an inability to fast on Monday because of studying?

It is permissible to fast on Tuesday, but fasting it specifically is not a Sunnah, nor does one receive the reward of fasting Monday by fasting it. However, Allah's grace is vast for one who was keen to fast on Monday but was prevented from it due to an occupation. What was mentioned about the difficulty encountered in fasting on Monday increases the reward for fasting it.