The 2 surahs are back to back and have interesting contrasting verses.

Surah Al kawthar starts by mentioning Allahs generosity in giving the Prophet Mohammad SAW the abundant goodness.  Surah al Maun on the other hand starts by mentioning the oppisite virtue of generosity, stinginess! It does so  by mentioning the one who pushes away orphans and doesnt help feed the need.

Allah swt in Surah al Kawthar then commands the Prophet SAW to pray for Allah swt, while Maun mentions the one who delays his prayer and prays for other then Allah, i.e. to show off.

Allah swt in Surah al Kawthar then commands the Prophet SAW to slaughter sacrifical animals for the sake of Allah swt, while Al Maun ends by mentioning the one who refuses to help with the smallest favors.

To top it off, Subhanallah,  Al Kawthar means great abundance , while Maun means the smallest goodness... So even in their titles we find a contrast in meaning.

Itqan by AlSyuooti

*Can anyone else spot any more contrasts?